My argument is that if the people like me who use Spotify in our cars didn't have that option, we'd listen to radio and demand radio stations that played diverse playlists. Spotify takes away all these customers and only leaves the people who want to hear the latest hit four times per hour. I'd argue the minute we could play CD's in our cars, radio of any quality was doomed.
I guess I didn't realize it's been common for so long. Living out in the sticks and in a small town with an independent (and it still is back in my old hometown!) they played whatever the hell they wanted to play.
When I go home, I find that they still don't repeat a song for days. It's not filled with B-sides or anything, but it's still quite listenable…except for Detroit Tigers baseball.
I was aware of the tightening up in the 2000's. I still listened to great radio stations in the other places I lived post 2005, but they'd always change format within a year because they were unsustainable.