I can't see how you'd think niche subgenres are replaceable by "influencing artists", for even very niche subgenres don't tend to gravitate around a single artist as you imply. Niche, and at first glance similar stuff like future bass, future funk and kawaii future bass are still easy to tell apart and have many artists producing original sounds that people still associate to the genre.

I don't understand your point in the end either, but it feels like you're trying to project anger onto other people. Do you feel angry that electronic music genres are not as easy to understand as you hoped and are trying to rationalize this as people coming up with random genres for publicity? Try to think of clear, obvious examples that should validate your rationalization, if it is more than just that then you'll easily be able to come up with a few without reaching for a search engine.

I guess if I had to summarize my point, you get more of what you reward. If you reward people for identifying themselves as super-niche genres with acclamation, you're going to get an absurdly-finely-sliced set of genres. It doesn't mean those hyper-fine genres are necessarily all that useful.

If anything, I kinda think it hurts artists to be slicing this finely. You can't really just be ambiently "creative" without having some sort of constraint and structure around you, but jumping into a really small box isn't necessarily a great plan either.