@Michael *******
You may be right. The guy who told me that (he was the owner the first Thai related bulletin board in late 1990s) had been in Thai 10 years by then, legal work.
That kind of insurance must exist, Thais are en masse in it, may well be good for those who want some affordable insurance for real possibilities without open heart surgeries and supersonic evacuations cover and live in Thai long term.
My "extrension of stay 1 year" does not require health insurance, I may have a look into that.