This has already been covered in a more general sense by this question: http://meta.ux.stackexchange.com/questions/1268/should-why-does-x-company-do-or-is-there-a-reason-why-x-does-y-questions

But as for Google-specific ones: Such questions should be - and are - flagged and put on hold as being 'Primarily Opinion Based'.

If all we can do is speculate on the reasoning behind why Company X has done something then that can only mean we would be giving our opinions on it rather than the answer.

Some questions are not so black-and-white though. Using Google (and other sites) as examples of a behaviour you are querying for use in a separate instance is not necessarily off-topic. But yes, asking 'Why does company X do {thing}' is. Please flag or close these if you see them and they will be handled by the rest of the community.

This has already been covered in a more general sense by this question: Should "Why does x company do...."or "Is there a reason why x does y" questions be removed?

But as for Google-specific ones: Such questions should be - and are - flagged and put on hold as being 'Primarily Opinion Based'.

If all we can do is speculate on the reasoning behind why Company X has done something then that can only mean we would be giving our opinions on it rather than the answer.

Some questions are not so black-and-white though. Using Google (and other sites) as examples of a behaviour you are querying for use in a separate instance is not necessarily off-topic. But yes, asking 'Why does company X do {thing}' is. Please flag or close these if you see them and they will be handled by the rest of the community.