In order to comply with government search warrants on user data, Google created a backdoor access system into Gmail accounts. This feature is what the Chinese hackers exploited to gain access.
This was written before we knew about 90% of the NSA dragnet, Yet here is Google’s statement, from CEO Larry Page, on PRISM (circa 6/2013):
First, we have not joined any program that would give the U.S. government—or any other government—direct access to our servers. Indeed, the U.S. government does not have direct access or a “back door” to the information stored in our data centers. We had not heard of a program called PRISM until yesterday.
Perhaps Page needs to clarify that just the Chinese have direct access to that backdoor?1
By the way, why are you still using Gmail? ↩