My main concern is that it feels like players are essentially being held hostage. The perform feature is something present in various other MMO's and none of them - to my knowledge - have such a strict policy in place nor have they had any legal issues to the point where the feature has had to be removed from those games entirely. There would be a lot of understandable backlash if the perform feature were to be removed from FFXIV, regardless of the reasoning. It's clear that there are plans to expand it over time so if at any point it is removed then that is cutting out not only current content but future content as well.

I would also be very annoyed if players start getting banned for performing third party songs in-game when known win traders have gone unpunished for multiple seasons in ranked PvP despite multiple reports...and Frontlines has been infested with botters ever since experience was added as a reward for both winning and losing. In short, I'm hoping it's just legal stuff to cover all their bases.