That’s basically my Pandora experience. They’ll have ads where if you click to watch a video, you’ll get X amount of time, usually an hour, ad free. There’s about a 50% chance the ad will cause the app to crash, but only AFTER the ad finishes playing. And once I start the app up again, it doesn’t remember the offer or that I watched the ad. Same thing if I close the app, accidentally or otherwise. If I start it back up, that ad free hour is gone.