Yep, I do this openly with obvious accounts to garner attention to how stupid sybil attacks are currently, how stupid easy it is to make accounts and game the Hot section, and the vote count.
Fair enough, but it would be more effective to sybil a post that explains the problem rather than a random Cheetah related post. Some posts like an exploit report that would hang on the top of the ranking for weeks is sure to push the message unambiguously.
RE: [Steemit Etiquette] Using 95+ Bot Accounts to Upvote your own Content. Fair Game or Not Cool?