Ashlee Vance and Peter Burrows reporting for BusinessWeek:

Over the last couple of months Google has reached out to the major carriers and device makers backing its mobile operating system with a message: There will be no more willy-nilly tweaks to the software. No more partnerships formed outside of Google’s purview. From now on, companies hoping to receive early access to Google’s most up-to-date software will need approval of their plans. And they will seek that approval from Andy Rubin, the head of Google’s Android group.

So, Android is only “open” until it becomes the dominant mobile OS.