Not sure what you're looking for from us here. If a player has multiple accounts and gets matched up with one of their other accounts and purposely has one team win, there's nothing we can really do about that while still remaining a decentralized game.

Ultimately, the solution is to work on bringing more players into the game since that will make it much more unlikely for a player to be matched up with their own account. Obviously bringing more players to the game is one of our top priorities.