As I understand it YouTube are just acting as a fairly impartial publisher and responding to complaints from copyright-holders should they wish to go further than the default a
demonetisation that I assume is fully automated/algorithm-based where the money is then paid to the copyright holder, I assume via PRS etc. This being why you can find countless full albums and live performances up there without any issue, but a very vocal minority of high-profile copyright-holders will block immediately they detect it. As such the argument isn’t really with YouTube at all, it is between YouTube content providers and certain copyright holders/publishing houses. I’m certain a huge number of musicians, likely a majority, will be perfectly happy for the exposure the platform brings as long as their work is fairly credited and not used as a soundtrack for anything ugly or inappropriate, even more so if there is a small but ongoing revenue stream.