Those are some good, solid ideas. Thanks for posting them!
I really like LBF's idea:
Approaching a store and asking if they would allow you to provide accurate care sheets with the purchase of each betta is another way to stamp out misinformation.
That's a really good call, imo.
This might be a bit silly? I don't know.. I was thinking of a kind of positive-reinforcement kind of thing.
Like, if the betta breeder's associations and clubs, etc, in an area got together and chipped in for a "Best Betta Practises" certificate (earned by keeping bettas in humane conditions - clean water and roomier containers - as well as giving sound advice on heating, food, etc) to be awarded annually to a store in their district -- maybe on a state level? City by city? idk.
But getting lots of positive attention and a nice framed award in return for kinder point-of-sale treatment and educating their staff MIGHT encourage stores to improve a bit.
If a particular store is listed as having recieved this award, and it's posted on the various betta forums, it's pretty decent advertising. I'd sure be more inclined to buy supplies and maybe even stock from a shop approved by the local betta clubs.
Not sure how that would even begin to be implemented, so perhaps it's just pipe dreaming. But I do think positive attention in some way might be another tactic in improving the lot of pet shop bettas.