The difference is iOS has non-standard gestures that is determined by the app, and Android it is enforced by the OS. It is infuriating on iOS trying to locate where someone stuffed the back button (is it a hidden pulldown? bottom left? top left? hamburger? breadcrumb trail? does gesture swipe even work here? ...) Much worse than when apps like reddit/tiktok override the back-to-exit behavior in android.