Does it matter dear fellow, Bitcoin is already rejecting all the negative developments. If there's a ban still there's a chance of a small short-term panic, that's it.

My dear fellow, now it's not the time when BTC is going to notice Bans and Regulations for example back 2 years ago 3rd largest country China Banned Bitcoin trading and crypto-related stuff then Bitcoin recovered and not only recovered but also made an ATH. How many times has China banned Bitcoin I can't even count now but as you know BTC is still standing good.

Bitcoin & China time to time waving History
check this out

Now China is going to have some experiments with Bitcoin after June check this out so Ban seems impossible but it is.

Then bitcoin will move to the deepweb-ish market. Pretty much like selling digital drugs.

Will I be negatively affected? Sure, but I'll be totally fine in the grand scheme of things. This is why no one should go 100% invested in bitcoin or in any asset at all, because of potential unforeseen circumstances.

It's true not all nations will follow USA, but you're wrong if you think El Salvador wouldn't follow USA because they have a good politic relationship [1] El Salvador use USD as their main currency, it's a proof if USA will have strong affect to them.

There are 4 big countries in this world, America and Europa, China, Russia and Middle East countries (e.g. Palestine, Pakistan etc). If USA will ban Bitcoin, China was ban Bitcoin from long time ago, while Middle East countries mostly ban Bitcoin usage, so your last choice is Russia. The volume will be hardly decrease since people will panic selling.

Don't mix between Hong Kong and China because they're a different country! China aka Republic Of China is still ban Bitcoin and only want to create their own CBDC, while Hong Kong was already legal if you want to sell, trade or hold Bitcoin [2].

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[1] https://sv.usembassy.gov/our-relationship/policy-history/
[2] https://en.wikipedia.org/wiki/Legality_of_cryptocurrency_by_country_or_territory#Hong_Kong

all that will happen is:

crypto businesses spend a little bit of money to register their brand in some tax haven country that is not banning crypto (this posts demo: caymen island for instance)
where they use "virtual office(pobox) address for their head quarter of the business. but work remotely elsewhere(around the world)

thus continue to operate but where 99% of businesses are "registered" under free jurisdiction of caymen islands

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mining farms will have more of a task of trying to find a area to warehouse their asics with a power company thats not forced to ban asic customers. where by this can centralise mining farms to only jurisdiction free zones. (small islands or countries that dont agree with the world economics of US control)
causing a cut in hashrate due to lack of power capacity for those small jurisdiction free zones

this power hashrate will cause difficulty adjustment changes and competition changes for block rewards that can affect the bottomline cost/value of mining thus profit cost per coin bottomline to change

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merchants selling produce can have their website hosted in jurisdiction free zone to take payment in bitcoin still. while having real world goods distribution centres in any country.
(EG facebooks financial arm is in ireland to avoid US and mainland EU taxes(it takes money in via ireland but still offers services to america avoiding paying american taxes or obiding by americal financial laws))

EG selling denim jeans for bitcoin. is where the website is for instance managed in caymen islands. but the jeans themselves are delivered from amazon fulfilment centres in america. where the caymen island bitcoin receiver sends fiat to american fulfilment centre to handle delivery
thus in short people can still buy denim jeans for bitcoin in america

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exchanges doing spot trading would HQ in jurisdiction free regions
where by yes they would not get much customer base due to the US jurisdiction on licencing of money service businesses. which if US banned licencing means a exchange cant then service us customers(or majority of countries should majority of countries ban bitcoin exchanging)

however people can just convert US dollar to [this demo] caymen island dollar. and then use the exchange to swap caymen island dollar for crypto

No one wants to have negative effects over bitcoin. If such a scenario exists surely bitcoin will be affected badly. When the usage is restricted surely it won't have the market as now. As users mentioned it can be used same as the dark web things. Such an usage will restrict majority of the common people who have a negative thought over dark web.

Lets be sure, such scenario won't happen, because with time countries that had banned bitcoin in the past have begun to legalize its usage. Some countries have started to organise teams that study and submit to the government whether it is necessary or not.

This is the key part that needs to be discussed. How many other countries would follow such a move.

You should keep in mind that the world is divided into many different fractions that don't follow each other. For example a country like El Salvador that has adopted bitcoin as a legal tender is never going to follow that or Japan that has adopted bitcoin as a legal currency.

We see that regularly too. For example US sanctioned Russia and is currently at war with Russia but a large part of the rest of the world is not following US sanctions, even some European countries are not fully complying with US.
Even in US itself which is more like a Frankenstein Monster than a country, different states don't agree on all the laws and regulations since they are more like their own individual countries!

The thing about bitcoin is that it is decentralized and the nodes and mining power is already well distributed across the globe. One country banning bitcoin is not going to damage that. Remember when the FUD campaign claimed "China owns 90% of hashrate"? When they banned bitcoin mining the hashrate barely moved (it moved more after the price crashed and it became extremely less profitable to mine bitcoin).
It will be the same if US banned bitcoin. In fact other countries like China may go back on their previous decision so that they can gain a bigger share of the market as billions of dollars would be wanting to exit United States and China would love to absorb all that.

For one thing, USA will probably be the last country to introduce censorship, because of the liberal and freedom-seeking nature of its population. Even The Pirate Bay is allowed to run there when all other western ISPs from Europe have blocked it.

I don't see them banning VPNs. Bitcoin mining is a different story - jealous people always rush to be the first to criticize it.

That is called inability not allowing!
They know very well that they can not prevent access to a website like piratebay with the existence of VPNs, Tor and even mirror sites. So instead they let it run and target the users who download pirated stuff through their ISPs while heavily censoring the site and all related links on the internet like the hundreds of thousands of URL takedowns by Google.

It's the same with bitcoin. They know very well that they cannot prevent bitcoin adoption and if some day they decide to ban it, they will start targeting the users. For example if your ISP realizes you are running a full node or connect to an Electrum server they will send you a letter of warning first and then shut you down if you insist on continuing it. BTW that is similar to what they do to battle piracy which is another P2P thing they cannot shut down.

I just have to bear and deal with it. There's nothing much I can do with it if there's a ban on everything related to bitcoin. But you know what's good with this matter is that they don't have complete control over it. Even if they ban it, it's only going to be available with things that they can see and it's hard for them to monitor transactions and know who are the people behind it. I have my investment in bitcoin and that will have a big impact on me but I'll just have to adjust whatever is going to be the policy where I am living.

There is only one case where bitcoin can be banned, and that is all governments join forces to ban bitcoin, there is no other way. But unfortunately, the world won't work that way, this world is multipolar. The US is the largest and most influential country in the world, but not everyone follows and follows them. If they had enough power, they could have stopped the war between Russia and Ukraine. Even if the US bans bitcoin, there will always be other countries accepting bitcoin, as long as they see the benefits of bitcoin. National interest always comes first.