Each user can write anything-see who trusts this user and many things will become clear to you!
You can write whatever you want, but be ready to face consequences. That thread is full of collusion, and given that we can see everyone's trust list it is clear that the users have agreed to it.
He's willing to overthrow several thousand ratings on scammers in order to get "strength". If that isn't a sign of malice and collusion, I don't know what is.
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I always found the Russian section a bit irritating for me. I even had a topic against one of the moderator long ago. What I learnt was that they basically favor each others to take advantages of anything. I will find the topic and post it here.
A similar thing happened with the Turkish section. I strongly believe that they keep each other's abuse hidden/protect each other because of it.