He makes a very good point that strikes at the heart of this issue. The conclusion that Yobit is a scam is an OPINION. There may be supporting evidence, but that is besides the point.
Non sequitur. You fail at analogies. The proposition that some criminals may abuse a good service, just as criminals abuse the Internet itself (thanks, o_e_l_e_o), has no logical similarity to the proposition that a service
actively cheating its own users is a
scam.
(Plus what o_e_l_e_o said.)

What analogy? Uh, no, actual sequitur. You are in fact using guilt via association. Additionally, as I already stated this application of negative ratings can only be applied in a completely arbitrary fashion by its very nature, thus this should be left out of the trust system. The only result of this kind of mass spamming of ratings will be to cause people to ignore negative ratings as common. It will stop nothing and have many negative consequences.