Do you know about musescore? It was a community tool that let users digitalize sheet music and publish it. They have lots of great public domain sheet music that used to be available.

But... they paywalled it all. And I'm suspicious to weather the creators are getting any compensation.

We would need another place for uploading public domain sheet music that isn't going to be paywalled by the servers due to a simple change of mind. Maybe #nostr could help us on this ^^