So this is a more weird question. For our rhythm game, we're planning on making a level editor accessible to users, and we'd like to encourage people to make and share their own levels synced up to the music of their choice. Since we don't have access to a server or anything to store the music people are using, our plan was to have players share a link to the mp3 file that matches their level in our comments section. Other players would then go to the link, download the mp3 file, and load it into our game to play the created level.

We're aware that this could result in players sharing copyrighted material, and so wanted to check ahead of time that this would be alright. We plan to include messages discouraging players from sharing copyrighted songs, as well as moderate our comments section + any song sharing threads we make to remove any comments linking to copyrighted mp3s.

It’s a cool idea, but as you seen to be aware, opens up a lot of potential for problems. I don’t have anything against such an entry since you’re willing to police the links, but keep in mind any DMCA related incidents could result in itch banning your account. It’s up to you if that’s a risk you’re willing to take.

One alternative is something like what Audiosurf does, where the levels are linked to metadata tags and the player needs to get the song file themselves.

Hope that answers your question.