One who adapts and diversifies will survive. It's a well known thing that you shouldn't rely on a single platform.
Creators nowadays are smart enough to build an audience on multiple platforms.
This is exactly it. And much easier for musicians to do as well. If you work with distributor like AWAL/CD Baby you can get your music on over 100 platforms: Spotify, Apple Music, Deezer, Anghami, Saavn, and Claro Musica to name a few. Not to mention all the business licensing services they work with.
Each DSP can be promoted separately with various methods (gleam.io, GDN, Spotify Audio Ads, FB Ads, Pinterest Ads, etc.) depending on the countries the DSP is popular in.
Then on the publishing side, Songtrust can get your works registered with 45 societies that covers 226 countries and territories.
Then of course there is touring and merch sales.
Sync licensing if you are willing to grind it out and develop contacts in the entertainment industry.
Patreon and Pledge Music (though PM has been having a rough go of it lately paying out campaigns).
Facebook settled a court case a year ago that will allow for songwriters/musicians to be paid for UGC music use on Facebook/Instagram and other platforms owned by Facebook.
The point is, a successful music business is using YouTube within a much wider revenue diversification portfolio.
Other creators can diversify as well, though it might not be as comprehensive as the music industry.
It's almost futile complaining about YouTube rather than just adapting. For all of YouTube's faults they can still be leveraged successfully to build a brand. Sure, it's not as easy as it once was but in many ways that's a blessing.