I scoped the comments to see what bots were being suggested (mimicbots, prudentbots, etc) and I saw much more focus on trying to enforce mutual cooperation than trying to exploit bots that can be exploited. I metagamed accordingly, hypothesizing that the other bots would cooperate with a cooperatebot but possibly fail to cooperate with each other.

There's a problem with that logic. Did you really expect the people designing exploitation bots to talk about them publicly?