Here's my story about a wild betta 'rescue'.
One day I went to a fish shop I used to go to quite regularly. Over time I had noticed that the standard of care for bettas had dropped considerably and so I started going there less because it was too depressing.
The owner got some wild bettas in, and when I went there one had what appeared to be columnaris (it wasn't there on our next visit) and the others looked extremely unhappy.
On my return visit, I saw a single tiny B. rutilans nose down in a pot of java fern in one of the display tanks. I think it's partner had either jumped out, been sold or died.
The poor thing was underweight and covered in ich, and so he had to spend three weeks in quarantine for treatment. Once that was finished, he got introduced to my group of B. rutilans and now he is the biggest and most dominant fish in the tank.
This is him today