“Given this revenue share, when (X) or Safari is successful in competing for an iOS user, rather than winning a full share of the search traffic revenue it only wins a partial share (ie the revenue to which it was not previously entitled).”
Google already pays Apple billions to be the default on Safari. Now it turns out Apple also gets a slice when you install Chrome to get away from Safari. The UK’s CMA buried it under redactions in a 365-page report. Apple has no reason to build a better browser or its own search engine when it gets paid whichever one you pick.