Not quite, no. As a user, Apple allows you to change your default browser in both iOS and macOS quite easily. As a developer you can build a browser on top of

Not quite, no. As a user, Apple allows you to change your default browser in both iOS and macOS quite easily. As a developer you can build a browser on top of whatever rendering engine you want, as long as you want to use the built-in WebKit. Crucially, they are plenty clear about what is, or isn't allowed (well, mostly — plenty of app review horror stories around here), and all of that happens in the interaction with developers. The user experience is always pretty decent, and you don't have to deal with this whole "do this in 10 locations" nonsense.