[InXorWeTrust]

Most likely not. If the bots were to suddenly turn into nodes, then there is a good chance that a large percentage of users could have their anonymity compromised.

Tor anonymity relies on the fact it is difficult to tie in where you entered the system, and where you exited the system. If someone where to control a large amount of nodes, they could (in theory) tie a large amount identities together. But this requires a large amount of entry and exit nodes.