Apple's behavior regarding ads is especially annoying to me. I deeply dislike that they allow Uber and Lyft to advertise via iOS notifications. Apple should inflict massive penalties on them for that anti-user behavior. Apple also advertises their own TV shows through notifications, which I view as an even worse breach of etiquette.

On top of all that, I avoid the iOS app store as much as possible because it's an advertising-infested mess. I'm sure I'd have more apps on the phone if I trusted the app store more.