The revenue funds more than just support, it funds the development of an entire OS and various SDKs to support the apps that it distributes from the store.
Given that, I think the world would be improved by reduction of such “development”.
2. Android comes bundled with chrome (and thus google search) as default. Google pays Apple $20B+ a year to keep Google search the default on Safari. That should tell you how valuable controlling Android is for Google's margins.
Like no-one at google seriously thinks they need to take a 15% play store cut to justify funding Android.
And we know they are not spending $30 billion on their SDKs.