But you can't install the Chrome browser engine on iOS, because Apple forces Google to use the Safari web browser engine, as well as any other web browser for iOS that isn't Safari - they all are forced to use Safari under the hood.

Looks like logic is lost here. My point is that the fact that Google used nonstandard feature so many years ago does not end up forcing users to choose a specific platform, which is the complaint there. And every browser has always done something special for itself. Whether "real" Chrome is available on iOS and how Apple comes into the question is completely irrelevant.