Apple wouldn't need to have secret deals. They're running a walled garden over there. You can't side load, and you can't run payments through the app without Apple's approval. That case was about Apple forcing developers not to even talk in the app about the possibility of making a purchase elsewhere, like through their websites. It wasn't a deal, it was Apple strong-arming a developer because they could.

The problem is Google wanted to have what Apple has: a closed ecosystem they can exploit. But they don't have that, at least not to the same degree. Android is not "theirs", even if they've increasingly managed to make the Play Store more inseparable as time has gone by, and getting worse about that all the time.

The most they can do is scare people away from using third party app stores or doing anything with Android they don't approve of, and when it comes to things like Play Integrity and Play Protection, they can punish you for stepping outside their bounds by breaking certain functionality (for having the audacity to want to control your own device).

But they can't outright control anything.

Which is where the deals come in. They're making shady deals to keep Android as their money maker and no one elses.

It's anti-competitive, because to spite Google's efforts, there is an actual opportunity for competition on Android, where as on iPhone, there isn't.