So it seems some TTB branches in Bangkok can open accounts for DTV holders, particularly DTV holders who work remotely! I can't confirm for the other category of DTV. They showed me a list of 4 items required, of which I was missing just one, which I've attached here. The other items are
1. Passport + DTV stamp inside
2. other ID from your country (license or ID card)
3. DTV proof like letter from employer/ employment contract/
4. The attached image - that's what I didn't have. What is that? It's related to residence though. They didn't care about my TM30.
TLDR : Answer Summary
To open a bank account in Thailand as a DTV holder, you'll need specific documents. According to users, TTB branches may accept DTV holders, but only if you provide a house registration document from your landlord. This should be accompanied by your passport with the DTV stamp, another form of ID from your country, proof of DTV status like a letter from your employer, and potentially other documentation related to residence. It's crucial to ensure that these documents are correctly prepared, as other banks may not accept DTV for account openings.
DTV VISA RESOURCES / SERVICES