And an aside from that is you could establish an offshore company, hire a desk jockey and then claim ah, its owned by a overseas company, and only pay tax on what you bring into Thailand (where appropriate).
ANYWAY... I can't imagine a competent thailand will be able to force foreigners to pay tax for world wide crypto.
Regardless of what the docs, rules, etc state... just ain't gonna happen, this is a country that is 'meant to charge tax' for your overseas holdings etc and doesn't, money you bring in and doesn't. etc
Even with CRS, they'd just see how poor the average farang︀ actually is (will be a upheaval for those).