I've only played at the lowest possible levels (at local card shops), so my experience is probably not super representative of the competitive scene. Pretty much everyone I played with was more concerned about keeping their cards in good condition than trying to angle-shoot their way to a free win (getting a few more bucks of store credit isn't enough motivation to ruin one's standing in what was essentially a social community).

I'm a bit more familiar with rules lawyering mostly because incidents where people got wins from it are somewhat common topics that people would bring up for fun. Someone might play a Griselbrand deck, and someone else would ask if they knew about the Borborygmos incident that led to the rule where naming a card doesn't require literally knowing the exact name, etc.