Interesting. So it doesn't have anything to do with the browser engine ban, since Apple presumably doesn't earn money from a Google search from Chrome on iOS regardless of whether it's powered by WebKit or Blink.
It does have a lot to do with the browser engine ban.
It means that if someone else comes up with a much better browser engine than Safari’s, iPhone users cannot use it so Safari remains competitive even though it may have a browser engine that’s lacking, since others are forced to use Safari’s browser engine and not their much better engine.
