Did you actually listen to any of the bands from the bandcamp link? A lot of them could not be called punk by any stretch of the imagination, but more genre tags mean a higher chance for listens.

Some extra confusion comes from the fact that “punk” doubles as the name of a movement (or perhaps an attitude) and any style of vaguely ramones-derived music. Most of the time, it’s used as no more than a nice buzzword that simply means “attitude” in a very vague sense. To exemplify, “Noone is as punk as Celine Dion!” is a sentence that both makes perfect sense (you understand what is meant) and is complete nonsense at the same time. The words “dubstep” or “zydeco” cannot be used in the same way.

Are you going to tell them they’re doing it wrong?

To be clear, is your argument that the term “punk” is completely devoid of meaning and if someone calls their music punk, it must be? That’s really not helpful at all.