So, there's an update. This is the current (new) plan for 2028:
Basically, you'll still be taxed (36%) on unrealized gains if you keep your coins in your own wallet. But if you "have" them in an investment account, you'll only be taxed when you sell them.
Please hand over your Bitcoins to Blackrock. That's what it boils down to.

There's a problem with that:

People just accept almost everything here. Life's still too good to risk it all.

So leaving the country is still the only legal option. I really hate how this makes me feel: my own government is making me choose: leave my own country, or let them take everything I own in the long run. You will own nothing and be happy fucked.

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From what I can find online, crypto will be taxed at normal rates (26.4% if you keep it for a year) in Germany starting next year. BUT: it looks like gains on "old" coins will still be taxed free, even in the far future! That would actually make it a very interesting option: I don't really need to speculate on buying and selling, just HODL is enough for me.

There's no "exit tax", if that's what you're asking. So if I leave, I stop paying taxes here.

For most countries, I think I'd have to realize my gains before moving. Here, that's still not taxed. But if I'd move to another country, chances are my cost base will reset to what it was years ago. So selling and buying back I think, which is annoying to do.

That would work to avoid paying taxes.
In the new Dutch system, I'd expect them to start implementing exit taxes soon, just like more and more other countries are doing. So if you leave, you'll pay taxes as if you've realized all your gains.

A good point in regard to Switzerland. If I understand correctly, there's no cost basis reset simply because private investors don't pay capital gains tax there, so cost basis doesn't really matter. No need to sell and rebuy, nice.

But it's not totally tax free tho. Cantons charge wealth tax on whatever you hold on Dec 31, so your BTC still counts, and the rate depends on which canton you pick. The canton determines whether you are a "private investor", and if you trade too much, you could lose the exemption. Mining/staking income is also subject to taxes.

For those who are interested:
https://www.deloitte.com/ch/en/services/tax/blogs/swiss-taxation-of-cryptocurrencies--how-are-investors-taxed.html
https://cms.law/en/int/expert-guides/cms-expert-guide-on-taxation-of-crypto-assets/switzerland

I believe that the actual issue with OP is the language and kids. Swiss has German, French and Italian speaking regions, they would still have to learn a new language. I'm not quite sure about Dutch nationals either, does anyone have any idea what the rules are?

Perhaps it would be worth considering asking a Swiss tax advisor which canton has the best wealth tax rate before deciding.

And I think this is good reference towards that statement you have said https://swissfinancemarket.ch/en/fiscalite-crypto-suisse-2026-afc-bitcoin

This is good site to look which countries could possibly give him much higher take home https://dual.tax/rankings/dutch

Also if you scroll down you can see the comparison of tax comparison on each countries.

Texas
See what I did there?

Seriously, the question may be less about what country to live in than which U.S. state.  In the U.S. only realized gains are taxed, so if you don't sell your bitcoin (or other assets) you pay nothing.  I know immigration can be burdensome, but with your skill set finding work and an H1B sponsor shouldn't be difficult.  The path to citizenship can be started almost right away, even if you're here on a work visa.  I don't know what you actually do for a living, and maybe the skills you demonstrate here are hobby only, but it's worth looking into.

As for Texas, it has zero income tax which protected by their constitution, and zero capital gains tax.  Property owners pay an annual tax on the value of their real estate, and they have a sales tax on non-grocery items.  Some areas are super remote and therefore super cheap for housing.  It can be difficult to find work in those remote areas, but for those who can work from home it's not an issue.  Many other states have similar overall tax burden as Texas, but may have low income and capital gains taxes, but also lower property and sales taxes, or none at all.

Even California, which has the highest income and capital gains taxes in the country is a huge improvement over your current situation.  Just to put things into perspective, the richest Californians will pay up to 13.3% income and capital gains taxes.  But, we also have the highest overall tax burden that includes property and sales taxes.  We also have among the highest housing costs in the urban areas, but the western slopes of the Sierra mountains (which are only a couple of hours away from the San Francisco Bay Area in the north, or Los Angeles in the south) have some very affordable and endearing towns that are much more affordable.  Western Nevada and Arizona are also great options for those who want to be close to California but don't want to pay California taxes.  Nevada has no income or CG tax, and Arizona's is a flat rate of 2.5% for both.