Wow, I had no idea about the interstitial. I happily pay for Apple Music for the convenience / never-sync factor (and, if I'm honest, to make it easier for my wife to manage music on HER devices without having to hook them up to the server and download from our library), but that's a choice I made. If they're being obnoxious with an ad for people who just want to use the music app on their phone normally, that's really disappointing.
I'm using Music app without Apple Music subscription. They are not obnoxious, I think that's an overstatement. Yes, they remind about Apple Music, but that's quite a rare event.
