I'll take a guess - there are lots of Betta lovers here, but they like domestic, linebred Betta splendens. The nature side of our fish isn't very interesting to a lot of newer aquarists, and if they don't see fancy fins or linebred plakat colours at the start, they aren't interested in watching. They want to see the breeder's craft.
They also, statistically, want to see videos under 3 minutes.
It's similar with Discus, where the highly linebred, far from natural Discus being mass farmed will draw more attention than the (to me) far more beautiful wild possibilities. Again, the ability to produce mutants is respected in our hobby, and nature rarely is. Some people can look at both and enjoy them, but fancy Bettas, guppies, platys, swordtails, mollies, discus, other modified fish will always be seen as interesting, while the real fish will appeal to a minority of nature nerds.
This video got me with "wild" I will look at any video of any fish if it's shot in the wild. I don't have to like the fish in the video, but the habitats are fascinating. So the subject heading will draw differently interested eyes.