What happens if some of those tax the unrealized gains bills pass in some country where they have obligations?
They would have to either pay the tax on gains or write off losses.
then they would sell some of the bitcoin and pay the taxes. If they don't have the wallet anymore then they don't pay any taxes.
Sounds good.
Edit: it seems perfectly acceptable and ideal even for society to say there is a cost to wealth. As others have mentioned Neovim is in the US is likely mostly tax exempt so this hypothetical doesn't even apply to them.
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Surely only an absolute lunatic would pass that sort of law. And by then it's too late, because it's Socialism with extra steps.
Neovim’s current donation page says that funds are managed by OpenCollective — a 501c6 organization in the US. 501c6’s are tax exempt.
So assuming they are the holders of the bitcoin as well, there would be no tax liability.