If people are forfeiting games to lower their deviation, then that's clearly a problem. And not, let's be clear, a problem due to player action. Winning should always be the best strategic move, if it isn't, then the game is broken, the players are just playing it as best they can. Creating rules to punish forfeits or require a certain w/l ratio is just a bandage, the problem is how deviation is calculated. If Glicko2 would ignore battles after you have a certain number of additional battles, that would probably fix some of the issues. Players discard accounts because there's no way to recover from a single loss to someone at 1700, and the discarded accounts cause the inflation. Give a way to recover from early hax, and situations like Lavos' don't happen. Stop the inflation, and getting to 2200 actually means something.