My mother in law has a bull dog, it's existence is pain.
It can't breathe right,
it can barely see because of fat rolls on its head and skin tags on its eyelids,
And it smells awful because of said fat rolls being hard to clean and keep dry.
I never get you folks. The vast majority of the ones I see are pretty happy love running around and typically aren't bread to be flat enough to cause long term issues. Nothing that would leave me to believe we need to gas all of them because of suffering.
Co-worker at an old job had 2 pugs. Their eyes kept popping out of their sockets. It got to the point where she didn't even take them to the vet anymore when that happened, she just popped them back in herself. She saw nothing wrong with this. In fact, during the time I knew her, those two pugs were elderly and eventually died. She then went out and got another.
The way I've heard it described "What if an alien race enslaved us and thought that people with down syndrome were their favorites and specifically bred that genetic trait because they liked it". That's similar to what people are doing with these pugs.