nothing, At least it’s my opinion. If you’re here and bringing in a lot of money from big dividends then you will be watched. Other than that I can’t see anything happening or changing. I pay taxes in my home country that’s where it will stop for me
it’s a written rule but only enforced if you are coming from a very poor country or you appear to be lacking funds to enter the country. It’s extremely isolated. For example, I have entered Thailand well over 100 times never been asked. Same for other people I know.