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Posting again for the /auds/ crowd, mostly relates to indies
Regarding setting up donations that won't doxx you I recall some anons a few threads talking about, after looking into it myself it seems setting up a paypal business account really is the best way and it should hide your real name, email and address
When doing it however choose a sole proprietorship/owner, it's effectively the most basic business form there is, where the business is run and usually comprised entirely by a single individual. It's probably the majority of businesses in your country, think of all the random tradesmen or tiny family stores etc who fly solo, so if you know anyone like that irl you could possibly ask them for advice if you need it.
You most likely don't need to perform any type of registration or legal stuff depending on your country but should look it up, where I live (Australia) you can just start running your business whenever you want until you start doing a bunch of dealings that would require a business number which you shouldn't need as a streamer.
Income earned with this business will also probably be recorded as personal income and taxed accordingly, so you don't need to do business tax but will need to sort out your tips (Not donations legally) by learning how tf taxes work or getting an accountant. If you somehow start raking it in big though and your simp bux will bring your personal income into a higher tax bracket than actual businesses pay, see if there is a way you can split your taxes so your chuuba money gets filed as business money so you don't pay as much.
This is also highly dependent and you'll likely need to confirm these things personally, but you could possibly file required expenses to be a chuuba as a business cost to counteract your tax as well (ex. Vtube studio, an iPhone to get proper tracking) but there's a good chance you'll get scoffed at and they will consider it just personal spending unless you make a convincing argument.