There's one upside to this:

From a legal standpoint, if regular people can be de-legalised, so can be billionaires.

Anyone who amasses more than 1bn should have their citizenship revoked, assets and properties confiscated, and dropped onto an all inclusive resort island where all their needs are met, for life. Put 1% of their wealth aside in a fund, the interest on that fund would easily cover all operations regarding the island, the rest, use it to support those most in need.