not possible any more since February 2025. You cannot get a bank account on a DTV, the news are all over the DTV-related Facebook groups. Your information is obsolete
you definitely can use the visa-exemption more often, if you never maximise the visa-exempt stays. But you always should be prepared to get pulled aside and asked. Have the famous three proofs ready to show: accomodation, 20,000 THB equivalent in cash, and onward travel proof
I hope you are aware that misusing visa exempt entries or tourist visa, for a longstay in Thailand, will eventually get you denied entry at the border. As long as you don't try to enter visa-exempt multiple times during a 365-days period, you should be fine. But you cannot use visa-exempt entries in a consecutive manner
why oh why would he need DTV? He is aiming to get a Thai bank account opened. He can do so on a 90-days Non-Imm-O visa. But he cannot get a bank account opened on a DTV, because the DTV is a tourist-visa type
no, you are not being forced to apply for an extension of the stay permit. You can leave Thailand any time before the 90-days stay permit is expired. And the guy who told you that your Thai bank account would be closed if you enter visa-exempt at a later date, is absolute hogwashed. Once you have opened the account while you were on a Non-Imm-O Longterm Visa, the account will remain active and open in the future, regardless on which visa you enter the country
yes you can. You can also use and get issued a multi entry 6-months tourist visa every other year - if you just stay away from Thailand for 5 to 6 x months within the 365-days period.