Checked out how the new feature works:
— Your profile shows a playlist with all the songs you’ve added, and others can see them.
— The rating system has nothing to do with this.
— To add music, just send a track to any chat (even Saved Messages), tap it, and choose "Add to Profile". You can also add tracks from other users’ profiles and playlists.

Pretty much the same as in VK 😁

@telelakel