I agree with you, it would be cool when people would share their effort more with their peers in a none commercial setup. I suppose, many of these services will only become really popular with professional content, when we leave capitalism behind. Those who spend a lot of money in creating music, also like to earn a lot of money when to start adding their knowledge and content to service like you propose. That said, I know a few professional producers who maybe interested to contribute. Actually, I know the former marketing director of Native Instruments and like to share your idea with her. She is out of the music segment at the moment (well, she is involved with Patreon now) but she knows a lot of developers with a passion for music. If you allow me, I'll share your idea with her. Was planning a brainstorm with her anyway, to explore the current music segment with the goal to come up with ideas for interesting concepts supporting the future of music and inclusion of all those who are not at the top of the pyramid.