Yes, it is possible to open a bank account in Thailand with a DTV visa. Several users have shared their experiences, stating that they successfully opened accounts (like with Bangkok Bank) without any issues. However, it's worth noting that some banks may have specific requirements or only offer savings accounts similar to those available for tourist visas.
Was no problem whatsoever. I was curious about it and opened a Bangkok Bank account just to try it, easy peasy. Won’t be using it as I’m happy with KBank/UOB accounts that I opened ~ 10 years ago but it was worth it as a trial run (and I was bored out of my mind last week).
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