Numerous people have reported being denied in Destination Thailand Visa (DTV). Some it was because they couldn't provide proof they were in the country they applied to, others didn't have the correct forms for Muay Thai, medical information wasn't accepted, names or passport numbers incorrect, etc. Some were issued medical visas instead of DTV when they only showed one appointment. People have been denied on e-visa but went to one of the few in person embassies and applied again. One person even had the original e-visa application denied, but called and the embassy let them change category for no additional fee. Embassies are tightening up on the requirements and are asking for more information.
Some posted in another group they had issue with this when Vietnam asked for proof they were still in country. Someone posted had the same issue with France but they weren't a French citizen. Some embassies state you must remain in country until your visa is issued, South Korea being one. If it doesn't state anything like that you might be okay.
the immigration office on Lipe gives the same stamps as any other office. It's a bit of a wait once you get there depending on how many ferries arrive and how full they are. It will seem a bit of a gong show but they eventually get everyone stamped in. Expect it to take longer on a weekend.
I'd consider editing your post with respect to the extensions having no charge to saying it's unknown would be more accurate. Historically every extension in Thailand has a charge. It's usually 1900THB but so far the fee involved with the DTV is unknown and is pure speculation. As numerous others have pointed out the MFA is not immigration and doesn't set the rules around extensions.
Anonymous participant what? Many people switch to Non immigrant O visa from a tourist visa in Thailand. There is nothing saying you can only get it in your home country. Are you confusing 2 year OA or OX?
Good of you to take it on and hope it works out! I think it's going to be a hell of a project considering every embassy is different, every situation is also different. Will you leave it open for anyone to update? Keep the core information for each embassy locked and allow people to add specific situations? Keep a section for each embassy for each category? Will it be updated frequently? Will be interesting to see how it works out.
Anonymous participant doesn't matter if you apply under Muay Thai or remote worker you are still considered a tax resident on day 181. How that works or is enforced is unknown.
there is no official period. It's a multiple entry visa so you could probably just turn around and re-enter same day. I say a few days because it doesn't make sense to me to pay to travel to another country, pay for a visa for just a few hours.