@Johnny ******
I beg to differ. Alex Ni explained it correctly. I am here with a workcation DTV and he is 90% correct. I still have apartments in 3 countries even though I am in living in Thailand 75% of the time now. Hopefully, I can handover all and go for a retirement visa in another year or two.
For softpower, I have been wondering why a 5 year DTV is issued for a 6 month course. After completing the 6 months course, these foreigners are going to stay for the next 4.5 years on the same DTV? I believe this is why the Thai immigration is checking on, if these people are not able to show proof of income, how are they going to support their living here? Work illegally or other even greyer areas?