Meanwhile, in the real world, without such wealth taxes, the problem is not' how do we accept all these donations and what do we do with the surpluses?'. The problem is that the wealthy spend enormous sums both capturing regulators to minimize tax, setting up legal structures to avoid tax (trusts, corps, etc.), and setting up outright illegal global tax evasion schemes.
What you propose does not even work on the scale of a condo building. That Miami building that collapsed couldn't even get agreement for years in time to expedite critical repairs, and it killed like half the residents.
Even myself, I'm proud to pay my taxes, understand that in every large complex endeavor or system there will be significant things that can be called out as 'waste', yet I also take advantage of every tax break my accountant recommends.
Enjoy your fantasies, and let us know when you are interested in joining the real world.
That's why bundling taxes in a few non-optional packages is so important. Otherwise people will try to selfishly evade paying for services they believe they don't need, and needlessly pry into public finances despite having no expertise in it.