How to not pay your taxes legally, apparently

For start-up founders: There are countries, like the Netherlands, where there is no capital gains tax. Move to such a country.

If you are a US citizen then US tax will apply to you wherever you are. People form other countries switch off their home tax if they do not meet residency requirements.

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.