Instrumental sheet music subscription service seems like an industry ripe for disruption.
For many pieces of film/game/pop music, you can't even find a place to buy the original sheet music. There might not be an original sheet music in the first place; let alone a fitting transcription for the instrument you are looking to play. What musescore.com offers, is largely built upon hobbyists' transcription efforts.
Which is the same model as one of the other holdings of Muse Group, Ultimate Guitar. It has a wide database for user-created guitar tablatures for most popular songs. Starting from 10 or so years ago, the experience has deteriorated rapidly; they - push their "Pro" versions at the top of each search result, - overlay a bullshit video on the actual tablatures which is easily mistaken for a video tutorial for the song you are looking at, - user created GuitarPro tabs require an account to download, - there is an ever-present countdown until their 80% runs out, which resets every two days or so.
When I first heard of MuseScore and the fact that Tantacrul worked on it, I was quite excited about an open source notation app but I want nothing to do with it because of their parent company.