@Gilly **********
One slight amendment to what I said before:
I used the word "always" when I should have used "long".
When I first got here in 2013, I'd run into people while on visa runs who were basically living here for years on end on tourist stays. Thai wife, off-the-cards teaching jobs in some village somewhere, the lot.
But then the 2014 coup happened, and they started enforcing things. The requirement to have proof of onward travel, accommodation, and 20,000 Baht (or equivalent) was already there on paper, but very rarely enforced.
After 2014, they started enforcing it, and demanding it from people they suspected of not being genuine tourists.
Obviously, this relaxed over Covid - but then after the pandemic ended, they cracked down again.