There have been discussions on YT about this before - just not nearly as often as puppies. Hopefully when people are convinced that they shouldn't buy dogs from petstores, they will also realize that they are supporting the same industry when buying other animals. I rarely see cats in petstores (unless they are rescues), so it isn't something I think about. There are bunny mills and such though which is very sad.
And there is tons and tons of information and discussions about factory farming here and all over the internet. A lot of people are quick to ignore it, reason it away, or whatever though.