So current rumor mill is a group got banned because they reset a world boss another group was killing..Then killed it themselves..Got a three day ban for not sharing loot with the group that was there first..
"Breaking the spirit of the game"

Is this going to be a common thing? Because..hell..I do that to people on a daily basis..multiple times a day..

If you do that on a PvP server, it's totally fine because that is intended. PvP away.

If you do it on a PvE server, it's supremely uncool and will be punished. It's not like the group that tagged the critter can defend their kill.