And how do they enforce it after you leave Portugal? Courts of your new country usually do not enforce tax for foreign countries, at least according to Wikipedia: https://en.wikipedia.org/wiki/Rule_against_foreign_revenue_enforcement . Of course, you should not return to Portugal , this is perhaps the only downside.

Bastardos

Exit taxes exist in a bunch of countries

How would they know how much "crypto" you have?

That is why non-KYC accumulation is the way to go. But with today's non-KYC exchange liquidity, it's hard to on board / meet enough demand if there was a sudden large influx of fiat trying to exit into bitcoin. We really need better non-KYC exchanges with better on boarding experience and larger liquidity pools...

What if you just run away to never come back?

Then you don't have to pay that gain in the next country right? Hopefully. Anyway it is strange to tax international property like that.

The US taxes your -unrealized- capital gains if you want to leave gitmo nation https://americansoverseas.org/en/news/us-exit-tax/

What the...