@Elías *******
You’re spot on about the rules changing, but you're mixing up different types of ED visas!
The central bank's crackdown on unverified accounts explicitly ended the easy walk-in era. Major banks like Bangkok Bank and Krungthai updated their foreign customer policies to restrict tourist-category visas (which the DTV falls under) and non-formal language school visas. Because language school enrollments were previously misused for setting up unverified accounts, those language visa holders are routinely turned away at branch counters today.
Full 4-year degree students at major universities (and ED Plus holders) still get accounts opened via their university's foreign service desk.
So the point stands: if you are on a DTV or a language school ED visa, the old days of walking in with just a passport are over. You now have to clear those compliance hurdles using secondary proof like long-term leases, residence certificates, or a local Thai guarantor.