If I had to guess, probably for the same reason you can't sue for not being able to pick what apps you install on your toaster.

Google probably opened themselves up to this monopoly shit by trying not to be as much of a monopoly as Apple is trying to be.

I've heard a lot of lawyers say that the law punishes virtually every good behavior because that behavior can be construed in a way that you can be sued for, and that it favors being a dick more than anything. In this case, that might be what happened?

I mean, not that Google is a saint at all.

Yeah it still doesnt feel consistent to me. Apple is a large enough marketshare holder for a handheld computer and doesnt even give you an option to sideload another market place. The explanation doesnt make any more sense just because google is more open.