Appeals Committee. Disputed situations in tournaments.

You shouldn't be too generous with rewards. In Soviet times, even in schools, more responsible students among the Pioneers tried to take responsibility for their less diligent peers, and in 90% of cases, the bad ones didn't become good, but the good ones definitely became worse or admitted their helplessness.
We are on an internet resource, and most of those here are not newcomers (80-90% at a glance). You can make allowances for newcomers and make comments, try to help them, especially since communication shows whether a person wants to understand and play honestly or not. But with those who have been caught and warned three times, there is little point in talking. They need to be punished, and punished severely! They've been caught three times, but how many times have they gotten away with it? Twenty times, or more! This has become a system, and such users need to be protected from honest and, in some ways, even naive users.

Helping lost souls means forgiving deceit, but who will take care of those who have been deceived? They are left to swallow their saliva, shrug their shoulders, and that's it. Of course, a system of rewards and punishments, incentives, praise, and a hall of fame should be introduced, BUT THE MOST IMPORTANT THING IS NOT TO INTRODUCE ANY RANKINGS OF BAD GUYS, ANY LISTS OF NICKNAMES! Otherwise, this will also be a kind of encouragement. You just need to punish those who play unfairly, inform users through some kind of general mailing list about the names of the unfortunate players, and punish them.