No, not really -- that would be a much, much more serious problem for Tor. (As I understand it,) Tor relies on the assumption that relays are controlled by a di

No, not really -- that would be a much, much more serious problem for Tor. (As I understand it,) Tor relies on the assumption that relays are controlled by a diverse group of people. If one person suddenly adds 3 million Tor relays, then it doesn't help anonymity at all, since that one person can now monitor a significant portion of Tor traffic. If I own every relay on your circuit, I can monitor your traffic; if I own three million relays, it's almost certain that a significant portion of the traffic will be running through circuits composed of relays I own.