Yeah, if you keep digging you will find seemingly endless discussion about many of these novel responses to the game that is the Steem blockchain, here on Steemit. We've got bots, trails, reward curves... It goes on and on.

Again.. 'allowed' is a funny concept here. It's a complex stake based system. It would be dead tomorrow if someone could just go around telling everybody what they could and couldn't do with their stake. The rules are in the code, after all. They are able to be modified with enough consensus, but the system favors free and unhindered use.