I have had no problems, they are not affiliated with steem in any way, what I mean by cheating is colluding with other players or other unfair methods to try and win, beyond that I don't think there should be any significant way to cheat.
I am going to have some admins in the group.
But I would not worry so much about signing up on bluffave you could use a one-off email address or use a throwaway one that send mail on to you, but where you can kill the address.
I would appreciate players in the club :)