On the same note, team hoppers, as many call them, do get noticed and their reputation noted by teams and their leaders. Known team hoppers are often penalized by not being allowed in some of the better teams. I know on my server, there's a team I respect a LOT called Naked Heroes. (If I wasn't leading my own successful team, and they'd have me, I'd sooooooooooo join this team.) If you join them and then leave, it's a one way ticket. You won't be welcomed back. Early on, before we became a truly successful team, we had players who left our team to hunt for trophies elsewhere. After we became the top team on our server and held some nice trophies, some wanted to come back. They were flatly refused. So while you can't stop team hoppers from team hopping, you can help teach them it isn't acceptable or ok in your opinion, by not letting them return. In time, they'll exhaust their options and their previous behavior will come back to bite them for it.