Actually, this could be a FAQ :)
There is a popular belief that cheetah implies cheater -- but this is actually a complete coincidence (but a cool one!) Back when you could mine steem people were chosing animal names for fun. There was bullfrogs, rabbits, badgers... so I chose my favourite animal. When I was testing the code for the first version of the bot, I used my mining account for testing, with plans to move over to an account named @automoderator afterwards. But before that happened, the community had already got on-board and started talking about @cheetah, so it stuck!
RE: FAQ about Cheetah