For me, it’s neither the price nor the quality of apps (idgaf, it plays music in the background). The thing that pushes me towards piracy is the same as for movies and TV shows: disappearing content. Because of content licensing deals, every piece of media is temporary on a service. I do rewatch movies from time to time and it’s infuriating if it’s gone (or rather would be, if I was still paying for any streaming service). This is especially true for music. My Spotify favorites list has a huge percentage of greyed out entries (and I’m pretty sure there are things that were outright deleted).