This is a major warning sign for anyone in the UK and the rest of Europe. The Netherlands will be taxing unrealised capital gains which will no doubt trigger a historic exodus of capital. When governments start taxing wealth that hasn't even been realised, they are telling you that you are a slave and your labour belongs to them. It's idiotic of course because capital is mobile and policies like this shrink the tax base but that won't stop the communists. Expect more jurisdictions to try it. Expect more wealth to leave. And if you can't leave... well... Bitcoin in self-custody is your answer. Just make sure to go on a boat trip.