Never get involved with a cheat. If someone can cheat in a game of cards, a video game or at quiz night, they are a cheat.
I once was visiting a training facility where they had the 10 most important rules displayed on the wall. The one which stood out the most went something like this: nobody cares what you lifted, how many reps you managed, or what you put on the board. Everyone cares if you cheated.
(The other one which stood out was: don’t be a chalk whore, but this is unrelated).
A cheat will cheat at everything. If they can cheat, they will lie and if they lie, they can steal. This is true on every level.