Here's the thing. Maybe many of the alternative app stores will do the same crappy stuff. But can you guarantee me that *all* of them will?
Think about brick-and-mortar stores. There are a whole lot of crappy stores, but there are also a lot of average stores, and some really good ones. Why wouldn't it make sense to believe that the same pattern would apply to Android stores?
Nobody's forcing you to sign up for these alternative app stores. But as it is now, you don't have a choice. I'd rather people be able to make their own choice, than Google make the choice for all of us.
You "refute" that alternative stores won't provide competition? Based on what? Your opinion?