"Cheat" might not be the most helpful way to think about this particular situation. More like a glitch in a multiplayer game.[1]
It's not "cheating" in that players are using the system as-is, and after a critical mass of people adopt it, there is no way to play competitively without it.
The simple answer becomes to patch the behavior out of the system, although that is rarely popular with the people who have adopted the strategy and invested a lot in the system.