there was an American who is a tax lawyer giving a statement saying just because you live here over 180 days does not mean you have to do a return. This is a bit like the millennium bug scam. Many companies saying it will only cost 12k to do your return. When actually you don’t need to do one so be careful out there with the advise you get
Depends on the people working with you to be true. If they think you’re taking the place of a friend or just a Thai I suspect they will inform immigration. Is it worth the risk?