How does smearing marmite make the unfair gain worthless? It might make you feel smug for a few hours, but if your enemy is vindictive, it could be used against you.
The best move is to avoid playing the game.
The best move is to avoid playing the game.
I think the person in question would be in vastly larger amounts of trouble for even raising his head above the cesspool he floated in for a moment. It would be like a chase from the Benny Hill show with local housing enforcement, HMRC, the police and a trail of angry and abused tenants.
The best move is making the game worthless so there are no winners. Shit on the board. It's a stalemate then.