I've had thoughts in this area before. Such a co-op could build a platform on which they can share media, crowdfund, sell whatever, and whatever else the artists want to do to get themselves out there.

Even if they didn't build and run the platform themselves directly (due to the fact that a bunch of artists have better things to do) - if they contracted out the development and maintenance to a third-party company - they'd have ownership over the platform, be able to switch maintenance company, and therefore take their fanbases with them if things start going wrong.