Hello @dobartim. It's also has been bothering me about the cheaters that ruined this community. I've noticed in some of your competitions post I found them(cheaters). I'm thinking about exposing them. I may have some suggestions how you should do the judgment about the winners for the competitions to avoid trash post to be voted by all of his/her 'gang' or cheaters with many accounts to vote themselves.
Here they are :

1. You should select the best entries from all the entries.
2. On the voting day, you put the best entries that you had been chosen to be voted by the participants or the judges.
3. Only judges or participants that took part in the contest can vote for their winners.
   That's it from me, maybe you want to consider it.
   Thank you