MS could not get shut out of the browser desktop market, period, there was zero chance of that ever happening, since they controlled the platform, >90% of the market. iOS is a locked down ecosystem, if iOS wanted to block Google ads, or change the default search engine, they could do it and Google would have no recourse. Big difference.

Note, Android allows Firefox, even as a default browser for opening links. That's impossible on iOS and on Windows RT.

I don't have any problem with people shipping free software, even Microsoft. The issue is whether consumers and developers have choices.