@Dirk *************
From what I understand there are a list of things you need to do and there is a point system. The tax obligation, maybe marriage, Thai language skills, public service, etc. I am a retiree who has never worked in Thailand but was initially intrigued when I heard a rumor that there was a marriage pathway. I joined that FB group and learned that I was not going to get there without the 3-yrs of tax payments.
I do know a couple of Americans with Thai permanent residency. They have been university professors in Thailand for over 20 years. They aren't much interested in citizenship. I don't really care about it anymore myself. I don't personally know any westerners with Thai citizenship.