For start-up founders: There are countries, like the Netherlands, where there is no capital gains tax. Move to such a country.
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There is no capital gains or wealth tax at all in New Zealand, but only for domestic investments. For offshore investments there is a deemed return that you treat as income, so if your wealth is tied up in illiquid stock then it can be dire.
I just learned about this fact this year or so and it's absolutely bananas how people are just accepting this as a normal thing. In what world does it make sense to pay taxes to a country based on citizenship rather than actual location/residency?