It looks as if they are even getting their publicity threads stared in Meta, so it is already leading to spam.

I see yahoo62278 took over job of a quality checker for YoBit, but given the fact that there are no limited number of users, and each of them can post up to 20 posts per day, we're probably talking about a few thousand posts that should be checked every week.
I do not underestimate anyone, but considering that he is manage few others sig campaigns, it will be very hard to keep all participants under control.