I have been here for about 10 years. I have had a number of visas but mostly tourist visas. Basically, a person who does this is gaming the system and therefore are taking some risks... But it's worked out for me.
I have been in Thailand for about 10 years with several types of visas, most were tourist visas. Not once have I been turned-away. I have been spoken to a couple of times but they let me in.
You never really know how its going to go. When Obama left the White House it was 36+, When Trump left it was 29.5. I figure 33 is the average, anything above is good, anything below - not good
Banks are kinda funny here, in my experience. Many times the bank customer must use the branch where they opened their account. Recently, I had to update my passport and I could only do that at the branch where I opened my account. I think this same is true for some/most/all immigration paperwork. Hence, your friend may want to open the bank account where they plan to settle.