That must have been very remote because I have been to some remote islands in Thailand and they all had fantastic internet speeds. In one of them (Koh Lanta) I remember downloading a 1080p movie in about 10 minutes. On wifi, inside a hut.
My last time 100% without internet was in Nepal, last year. Nearly 40 days offline.
Interesting. What were the costs like? of the different components of the stay there, not just Internet. I've been in some remote places on vacation, but some of them did not have good Internet access or it was expensive.
With 20 dollars a day you're good in most parts of Thailand, including a clean decent bed to sleep on and two meals a day. I never paid for fast internet there anyway, it was always free and included in the bungalows prices.