I played 3 matches in Rumble today. All 3 were different lobbies, 2 of them had groups moving as a team. Same thing happened yesterday, people were running together to finish the Imprecation quest. They would kill anyone who came near then would kill each other with Imprecation. When they noticed I was using it they tried to invite me and I promptly left. Fireteams need to be disabled for Rumble or this will never stop.
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I had the same issue. I think the solution is simple: any sword bounties/chaperone bounties/first curse/etc. should have it such that kills on players on same fireteam does not count. Problem solved. This way, we could even do 6 man fireteam rumble games without any boosting issues. Because playing rumbles with friends killing each other is really fun. But boosting is BS.