As they said in a blog post, Starting at the end of August, they started to see a sudden spike in the number of Tor clients:millions of new Tor clients and the numbers continue to rise.
The right question / answer “Where do these new users come from? My current best answer is a botnet.”
Sounds like impossible for them to have a explosion of newcomers like that, but who knows.. my toughts are that soon enough we will get some free cookies from pastebin while reading about biggest companies pwnage. The time will clarify this, lol !