Or there are other reasons that might have led him to take an action like this?
It helps to know how restrictive US regulation is.
In some US states, its illegal to play fantasy sports like fanduel or draft kings. Americans are banned from crypto exchanges that allow trading on leverage. Banned from using the best sports gambling websites like pinnacle. Banned from buying or using stablecoins like tether. Banned from using crypto ETFs which are available in europe and elsewhere in the world.
Being an american citizen by default ties your hands and prevents you from using many of the tools, platforms and assets needed to make money. Then you get hit with high taxes that are only getting higher. And inflation that isn't going anywhere positive soon.
Its becoming common for americans in finance renounce US citizenship and move to puerto rico for its 4% income tax. Which could be part of the reason behind Biden's latest push for global tax initiatives.
Many wouldn't think twice about paying $200,000 to renounce US citizenship and acquire citizenship elsewhere. There are many doors that open, and new opportunities that can be had. By no longer being under crippling US taxes and regulation. I would imagine something similar is happening in china, with those seeking to escape crypto bans. There have been reports of chinese moving their crypto mining ops to other countries to escape the ban. It will be interesting to see what steps if any the US and china take to try to cut down on capital and business flight.