I work in the music industry. An important thing said once to my arrogant twenty something self by a product manager: "Our market is amateurs. The pro market is a unsustainably tiny." There's basically no product in the music industry that can be supported by just pros. There just aren't very many of them.
And again, most drummers and bass players don't create complete tracks on their own, and they're the main thing people are looking for. And honestly, a lot of drummers and bass players don't want to come into a band where the guitar player has already decided what the bass and drum parts should be. You can get a lot from listening to sketches / noodling. (By noodling I mean mainly improvising something unaccompanied, not necessarily trying to win the gold medal at guitar gymnastics.)
I'm a bass player. A younger version of myself lived from playing bass for a couple years. I still play quite a few gigs. I very, very rarely produce tracks (one every few years), and there's very little of my bass playing online.