Even if Google doesn't use it for mining, I put this subject as a reflection. The giant can eat the small one, this is what I'm saying, another big company could build a computer like this and try do mining, I don't know, pure especulation...But WHAT IF it was true? May should we be worried about it don't you think?
How about you read the actual content of the thread before asking such questions? Being a million times faster than a regular computer is still weak in terms of hashrate. By the time that they have this product ready the hashrate of the network will go long past 1 Exahash. 
(sorry if it was a newbie question, but it matches with my status as member).