Can my friend use border bounces to extend a non-B visa while their startup company is not yet set up?

my visa runs to Kota Bharu was a rather strange feeling, empty bridge crossing to Malaysia, looked almost abandoned of activities, I was the only person there while giving the application, the were several open-air old-type brothels, heard males shouting go away, street lights none at that location, the hotel had a large dark nightclub was only me and the 2 Chinese chatting far away, no girls at all, but I got a nighttime visit of 2 of them, while the door was locked, somehow they manage to open the door when I was sleeping nicely, did not fit type to compare to normal runs elsewhere - super simple, the friendly/sexy employee girl even asked me, why not multiple entries on the Thai visa can be a plus, said okay I'll take that - a long time ago

Bounce this back to your accountant.

Your friend May have a multiple entry non B ( as Brendon mentioned) these are pretty rare but are out there. The only place I know of who were offering them were Kota Bharu in Malaysia, but that was pre COVID).

Otherwise, they would likely be coming to an end of their first 90 days non b visa. This can be extended in country, but, as the startup is new, then your company probably doesn't have all the necessary documentation they immigration needs to process this. Your accountant needs to speak to immigration to see if there's a way forward.

Otherwise your friend needs to jump on a plane to a neighbouring country with a stack of papers to get a new 90 day non b.

Should take 2 days. Pre COVID I used Kuala Lumpur. Submit in the morning. Pickup next day in the afternoon. Be sure to check public holidays for both Thailand and host country as they observe them all ( only make that mistake once). You need to book an appointment at Kl which actually works well. Good luck

Did your friend get a multiple entry non-B visa? It's very rare so I doubt this is what they got.

You cannot use a border bounce to get an extension on ANY visa. The only time you can use a border bounce to get more time is if you have a multiple entry visa, so you leave and re-enter to get a new entry stamp on the visa.

Your friend needs to take a bunch of paperwork from their company to immigration and apply for an extension like everyone else that's working in Thailand.