I think your recourse should be in a real world solution and not a soft-lawyery-fake-solution. I.e. with the board-flipping-case, glue your board to the table. Pretending copyright is a thing you can use to prevent people from flipping your boards is just stupid and ruins the copyright system even further, beyond the broken mess it is now.
In real life games, say, a tennis match, you have someone sitting outside the playing field checking if you are playing by the rules, and stopping the game if you don't. That is the correct way to to things. You're not going to sue all the players that don't follow the rules, you just kick them from the playing field.