Google's position isn't so cut and dry. They allow alternative app stores, and even installing apks from any rando with a website. Google makes sure you know there's risks, but it's easy to do. That's an extremely different situation than Apple.

Google basically says, "we have a store. Sell through us and we take a cut. Or sell directly, or through some other store, and we'll warn users that we haven't vetted that stuff for security etc."