Google's "iron grip" seems to consist of making APIs in their open-source product so that as many user-facing parts of the operating system as possible are prov

Google's "iron grip" seems to consist of making APIs in their open-source product so that as many user-facing parts of the operating system as possible are provided by user-installable and interchangeable apps, instead of something baked deep into the operating system. I'm not following how that counts as an "iron grip" or monopolistic behaviour.