, do you know if this applies to any other NON-O visas (based on having a spouse, dependent children, etc), or does it only applied to visas based on retirement and being over 50?
Has anyone actually seen this requirement stated in writing officially somewhere?
I've personally never had a problem trading or converting crypto into baht via p2p exchanges here. Someone above mentioned BX Thailand. They're ok, but deposit and withdrawal times can be pretty random. They've also banned all US customers recently due to FATCA I believe. If you have access to to a foreign crypto exchange and a local one in Thailand, you might actually find some pretty good arbitrage opportunities considering that BTC here often trades at 3%-15% higher than the global average.
As for trading legality in terms of work/tax, I couldn't say. Answers will become clearer when people start getting too rich in ways the govt hadn't thought of itself. Good luck & #HODL