Well, it was bound to happen, especially considering how demanding Pokemon Go can be to play. This isn't a game you just turn on and play. This app makes you be quite active, which can be kind of hard for some people. People can't just be playing this all the time, with everyday life things keeping us busy. It could get boring to some, and tiresome.
Still, 30 mil ain't nothing to sneeze at, and it sure doesn't make it any easier for me to take and maintain gyms.