Cover musicians can play music with their own instruments/instrumentals as a stepping stone.
Not a lot of the music streamers/performers have their own music. A lot of us music streamers are also people trying to get to the industry but still have no resources or skills to their own music. Our main way to get through the first step is covering and practicing music from original creators. We know we don't own all of our music but we want to learn and start from these music. We also know that all music are influenced by others as well. So this is kind of impeding us to share music and to grow. I know Twitch is just one of many resources but still it creates a great impact to a lot of the musicians in the platform who want to launch and practice.
A lot of streaming platforms are okay with it as long as it is done with the musician's own flare and not using the full copyrighted instrumental. So maybe that could be a start. Please allow us to showcase and grow.
Or at least have a licensing fee for musicians to play covers. :(