Globally, yes. Not in the US, though. iOS sits at around 57%, with Android at around 42%.
> Apple also has the benefit of being a sole operator of its platform, whereas Android and the Play Store aren't Google-only.
But yes, I think this is the key reason why Google and Apple are being treated differently by the law.
I think that's garbage, though, from the perspective of what feels reasonable to me (regardless of the law): Android has always been more open than iOS, and available to many different manufacturers and organizations. It's a bit weird that this openness means that they are required to be even more open, while a platform that has always been much more closed can remain that way.