I think a better solution to the current default model here would be splitting this up.

Give the artists a service where they provide their music, nothing else. They just upload the files, metadata, pricing. Only the technical side of things. Then another service is for the end user to actually listen to the music, but instead of having that content on the end-user service they only connect to the artist platform. For this to work there needs to be a default hub to which every artist service is automatically federated. (On that topic, why is it so hard to just federate entire instances everywhere in the fediverse, I get the moderation workload would be insane but it really works against the idea of decentralization)

Also another problem entirely is dealing with the payment providers, afaik they really don't play ball with tiny platforms so getting support for those into the service would probably be a pain