I don't like the ridiculous number of settings you have to tweak to stop google from spying on you, 4 settings levels deep somewhere. I don't like that google made phone manufacturers take the "disable location" button out of the quick menu. I don't like the restrictive policies of the app store that is downright prudish, and how every app on the app store is just laden with crap and ads, and often also spies on you (i do use f-droid to circumvent most of that when possible). I don't like how you literally cannot control your phones update behaviour. I don't like how after a couple years, the phone will stop being updated and you'll have to buy a new one or just accept that your phone has security holes that will never be fixed. If you're using a modern phone os, you are fundamentally not in control of the device, and it will make sure at various points to remind you of this.