Everyone is doing that on griefball, you kill one and then die until you hit cap. If you don’t follow their rules you will be killed and betrayed every single time you get near making griefball unplayable. You either follow their trend or afk/die every sec.
I can’t say it is bannable but I find asking if they could just do the first round to get their max exp and tie then play for real tends to lead to really good matches overall, as not all community members on halo are 13-year-olds that cry about having fun by playing the game as well. Granted there are still bad eggs that ruin this with betraying and such but toxic people are everywhere unfortunately in games. On top of this most of this will go away once double exp weekend ends and it will just be the bots and macro afkers that we’re normally stuck with. The biggest issue that unfortunately causes this is that a game of invasion (which takes a lot more time to complete, they same can be compared to other game types as well) give the same exp as a game of grifball does which unfortunately means those looking to maximize their exp gain during the times they can cause them to all go to the quickest way to get the exp in this case grifball. After all many do this because they either 1. don’t have a lot of time to play but still want to level. 2. want to level but playthings that don’t give exp so their just trying to get it over with so they can unlock what they want and go back to their custom games, firefight, campaign challenges. 3. They really don’t like the low cap of exp and want to get the most of it during double exp. 4. A mix of the 3. And 5. They might also just be impatient children. (Don’t have all that much care for the last one) Keep in mind I’m not defending or siding with either side on what is wrong or right but just giving the information as I have gathered while talking with people.