You can't be expected to know everything before you come here. Useful post with the level of detail and it's still useful if people can make helpful suggestions about some of the things in the comments.
I have been here a long time and didn't know that there was such a widespread issue with apartment listings. I knew this happened that agents would list stuff that was gone to bait and switch customers but not to the point that almost anything you'd look at wasn't a real listing. I haven't rented in Bangkok from these sites but I have looked at them with the idea that if I did at some point want to rent there, that would be what I'd be expecting, so it's useful information to me that it may be difficult to get what is listed.
Anonymous participant it doesn't with Wise, the amount you enter in THB is exactly what the receiver gets.
You can actually do it this way with a regular Swift bank transfer as well, there is an option to pre-pay all receiver fees ("OUR" code), but with most regular banks this is expensive. Wise is very inexpensive for transfers.
Anonymous participant Wise is a good tip, it's cheaper than most banks for transfers and guarantees an exact amount to the receiver, there is no additional fee Thai-side.
It's possible to get a local bank account, just difficult; it. May be worth using an agent.
Cheapest is NT Telecom with unlimited max speed for 6 months for 599B but this is data only (no calls) and coverage is not as good as AIS. I have used it as an internet backup as it really is unlimited and can tether. I get around 30Mbps down, but only 5 up at home in Chiang Mai.