Too many issues with this. Who will hold the money? How to secure the funds properly? If using a multi-sig, who owns the key? How can you trust some random people on the internet to manage your funds properly? Etc. I'm sure someone already proposed the same idea long before you. Even if you somehow managed to convince people to invest in your new company, how much can you spare to buy Bitcoin? Will the profit cover the cost compared to doing DCA on your own?

Indeed that doesn't make much sense. Bitcoin doesn't "work" in the sense that it pays dividends. While some exchanges offer Bitcoin lending and "staking" (in quotation marks because Bitcoin has no PoS so it's simply a centralized financial product with interest) for example, these services are inherently more risky than Bitcoin.

Strategy 21 Capital are currently working basically as leveraged Bitcoin positions. If you hold 1 MSTR share, it's basically a Bitcoin amount with 1.5 - 2x leverage. This varies a bit over time as the BTC/share ratio (in this case, NAV to share) isn't fixed. But you can simply buy Bitcoin options to do that, or options on Bitcoin ETFs.

Decentralized options would be a nice idea to decentralize leveraged trading, one forum user had an idea some years ago how to implement them, but I haven't seen this technique anywhere until now. (On Ethereum however, there are some similar products, but they use wBTC which is not decentralized).

It's terrible idea and will turn to horrible community treasury.

If people want to buy bitcoin, they can buy it very easily by themselves. If there is age restriction like too young, are under 18, they can ask their parents to create accounts and buy bitcoins for them.

In Bitcoin, being self custodians of your bitcoin with open-source and self-custodial wallets are very vital practice.

The idea to ignore direct bitcoin purchase but alternatively buy shares launched by community Bitcoin treasury is very terrible.

No, I won't be interested and probably there idea has been raised before and obviously been shot down already. There are more questions in this setup like who will be the custodian? And it will just defeat the whole purpose of being decentralized and (psuedo-anoynmous) in this game.

Right, that's what I'm trying to say, each and everyone of us here can have a strategy, specially that majority is just average joe, we can really start from small just like what the OP proposed and when we grow our Bitcoin, we can buy our hardware wallet and then continue.

What's the point? Why don't you just buy Bitcoins and keep them in your cold wallet? This is a way better option than relying on a "community".
I'm usually very suspicious to "community driven projects". Most altcoin/shitcoin/shit-token projects were labeled as "communities", which didn't stop the developers from scamming the investors. "Community" is just a marketing buzzword at this point.
What's the point buying "shares" in a Bitcoin "treasury", when you could buy actual Bitcoins?
I don't know if you are newbie or an experienced crypto user with a newbie forum account, but you should know the saying "Never trust a third party with your coins."

I prefer to do that by my own personally. I can manage my Bitcoin without other people interfere. I can take care my Bitcoin without telling them. Many things I can do with my Bitcoin including the time to sell and I don't need other people agreement to do something with my Bitcoin.

You can do the same as me and other people to accumulate Bitcoin in your wallet. Having Bitcoin investment will be personal decision so we don't need other people agreement.

I do not think you know exactly what you are offering. You are offering a community with bitcoins in its treasury but for what? These companies have a purpose and most importantly a profit to make. They invest in bitcoin because they think it would give them profit and this profit is what will be used to further improve their company and again to further make profit. You do not just group a bunch of people and call that a community and ask them to hand you money so you can buy bitcoin. If you have a company specializing in anything then you will get investors and if you tell them you will be investing in bitcoin they might be more interested and buy more. It is all about profit. What will you offer?

People really love to complicate things.  Why think of a scenario where it can create a problem not only for you but for all the people who will participate?  Bitcoin encourages being our own bank, so I think there is no need for this community-owned Bitocin treasury.  It will only put my Bitcoin holding at potential risk. 

Let's make things simple, if one wants to hold BTC, just buy and store it in a non-custodial wallet. If one wants to accumulate, DCA, Bitcoin does not offer any dividends so I don't see any advantage in creating a Community Owned Bitcoin treasury since we are not in an organization that shares a common goal.

it will certainly be a problem because what if one person wants to sell the bitcoins? what if they see the profit that’s been made and decide that they want to benefit from the profit already? how will the profit even be distributed? it’s just complicated and unnecessary just buy your own bitcoin

You hit the nail on the head, there is no need to complicate things, buy your own Bitcoin, no need for second or third party involvement, DCA if you want to accumulate for the long term. The main idea about Bitcoin is decentralization and that self custody, only you can have the control over the Bitcoin that you own, not necessary to belong to any community owned Bitcoin treasure. Besides, this is an anonymous forum and it is not the best place to have a community Bitcoin treasury.