The global regulatory crackdown on Bitcoin could happen in different ways, such as,
1. A more strictest anti-money laundering and know-your-customer regulations:
This laws are already there but the governments might impose more stringent requirements on Bitcoin exchanges, wallets, and other services that's helping most users to comfortably adopt and accumulate bitcoin.
The trend is different, even with more regulations, it's not like a global crackdown on Bitcoin. More regulations are what governments want but they can not stay oppositely and against the global trend, better adoption on Bitcoin.
Are Bitcoin Spot ETFs in the USA since 2024 is to crack down Bitcoin?
2. Ban on Bitcoin transactions:
Some countries already done this, they ban Bitcoin in the country and not allow people to use it. Right now, am not referring to just one or two country that didn't ban Bitcoin, I means if it's a global crackdown.
They can not ban Bitcoin transactions, never, and citizens can figure out ways to use Bitcoin if they want. They of course need to know about legality of Bitcoin transactions, usage, ownership status in their countries by existing laws and be responsible for their actions.
3. Taxes and levies: We can see that there are taxing on Bitcoin transaction on users by the government of some country. Not in my country yet.
Personal income tax, and capital gain tax are common tax types as I know. No tax on Bitcoin transactions so far in any country afaik.