Citizenship based tax residence only applies to USA and Eritrean citizens.
That doesn't sound correct. When you become tax︂ resident in a new country, that becomes your basis for becoming tax non-resident in your︃ passport (birth) country, assuming you meet the criteria, and it usually involves a slew of︄ paperwork and process to get that status. Once it has happened, the original country would︅ need evidence that you've triggered their residence tests since you became non-resident, otherwise it'd be︆ pointless them pursuing you.
I didn't see︉ this point being raised - what was your country of residence during the time you︊ purchased and held the crypto?
No one seems to have pointed out the issue of︋ exit taxes. If you want to be 100% legal, you should check if your country︌ charges them. What's an exit tax? When you become tax non-resident from a country, that︍ country may charge you capital gains tax on the value gain of your assets during︎ your time of tax residency. You might get away with not declaring, but you're speaking️ about millions here. Read about Roger Ver's recent tax evasion conviction.
This sounds like a trade to me, a capital disposal and acquisition. You'd be trading a cryptocurrency for a valued share of a company, no?