Tax Avoidance Possible but in a few countries. Depends of your passport and residence too. For example Georgia - 0 fees on crypto income, but it can changed in any time. Passport - you should declare your income in your country of residence.

One of the option is: Come to the country where there are crypto exchanger (like Georgia - Tbilisi, i heard also there are a few in Turkey), send them crypto and get cash.

Anyway - the more totalitarian government (USA, EU for example in my opinion) you have the less chance to explain where did u get funds. The less "formed" government you have then easier to explain the source of income \ hide income