You would need a Thai company, Thai partners, a work permit each with 4 Thai staff per work permit. The chances of getting approved for a market stall are slim. To do all that legally with just one wp you would need to make about 70k per month to break even. You should also need to rent business premises as a market stall wouldn't count.
Yes those Indians, Pakistanis, Russians, Turkish, Israelis etc doing it in Pattaya etc are illegal unless they have Thai citizenship, they didnt get it through running a market stall.
Banks (worldwide) have claimed down since well for a good few years now. New banking regulations worldwide due to money laundering, fraud, scams and illegal workers and businesses. Its not something new right now. Bangkok bank weren't supposed to be opening accounts for tourists but turned a blind eye to the rules.
Says the numpty who is telling people the maximum fine is 2000. 🤣 Oh youve only got 180 days in the country. So tell me how you can miss it 10 times. 🤣