Here's a more upthread link with a bit more context for the discussion:
The truth seems to be both (a) unpleasant for Andy and (b) unremarkable to the rest of us. In other words, it wasn't his choice, but there wasn't a scandalous smoking gun either. He just wanted what Larry wouldn't give him. Nothing that would be front page news.
God knows when I hear things like that I thank my lucky stars I don't have to work in a large corporation or answer to anyone but customers. (Well more than that obviously but at least I'm not at the whims of corporate culture.)
I suspect my hopes will be dashed.
Andy definitely got bored and went to work on robots before. He even says that in the article.
As for what happened this time, no idea.
I have some guesses though, and none of them are "forced out".
Edit: I found this quote from [1]. "Jessica Lessin at The Information tweeted that Rubin wanted more freedom for his robotics group. She said he wanted a structure like Calico, which is the anti-aging company Google has started.
Our guess is that Page views robotics as something he understands better, and considers it core to Google, and therefore would not want to give it the same independence. "
If so it seems rather short sighted for Page to let somebody like Andy Rubin leave. Rubin is self motivated,passionate,driven about what he does and he could have done great work with robotics.
[1] http://www.businessinsider.com/andy-rubin-out-of-google-2014...
2nd Edit: At least now I'm hopeful that Google will not own robotics.
But this is a wild guess. Andy, from what I've heard/known, never particularly liked the "CEO" aspect of his job. So having a more traditional structure would probably be more than just "not enjoyable" to him.
https://news.ycombinator.com/item?id=8506911
Google employees were implying that Andy Rubin got bored of Android and left to work on robotics and people suggesting the opposite were getting downvoted. It still could be true but looks less likely down.