Maybe the formatting wasn't entirely clear, but "licensable smart mobile operating systems" and "app stores for the Android mobile operating system" are two different categories.

As for the latter being a thing but Apple not getting into trouble for their iOS App Store monopoly, I guess that is because Apple isn't using that "dominant position" to prop up a dominant position in another market (like Google is propping up their dominance in search engines).

Or maybe the overall consumer harm is considered to be much smaller, considering that Android has 80% smart mobile device market share in Europe (according to the EC press release), and iOS has a much smaller share.