Agreed, although you can invest in property and $500k put in a condo in BKK seems pretty sure to stay yours. Liquidating that could take some time though unless you pick well.well bc this 500k has a lot of characteristics of a dono (if you're foreigner).
Plus you need to declare 1M usd, might not be great for your safety either (but as they have 100k usd millionaires themselves this might be ok if you are in the rich neighbourhood).
For safety reasons, Id still tend to avoid this tho.