After 5+ years in Dubai, I started looking for a place in Europe to relocate. So I requested a binding tax ruling from the Portuguese tax authority. I explained my situation and asked how I would be taxed if I moved there. It was supposed to take 150 days. It took more than a year. I finally received confirmation that I would pay 0% tax on crypto gains for the next 10 years. Only issue is I quit most of crypto in late September.
