And this is where I part ways with a lot of people's thinking. It absolutely is PvP. It's a player vs another player in an environment where that is entirely possible. Elite players aren't forced to PvP. They can play in Solo. They can play in PGs. But Open, as I mentioned before, is swimming with sharks. If you're a little fish and you get eaten, that's life. And I say that as someone who has been the little fish, the shark, and the octopus watching them.
Versus, as used in PvP, includes a concept of competition, but you are supporting a position where the aggressor does not Want competition. In fact, they are going out of their way to "lose" inside the game because the pay out for seal clubbing is normally a net loss. Ammunition, if used, will cost more than any salvage, and the time spent yields no tangible value.
You cannot even argue that there is challenge because the aggressor has specifically chosen a victim that cannot fight back.
All of that said, with no in game benefit to be had, you need to look for benefits external to the game. Since the players likely do not know each other (11+ million accounts), Occum's Razor dictates that the aggressor is looking to cause distress or grief to their target, either the loss of time or financial value.
Most likely, this is an example of Online Disinhibition Effect, which is to say, the aggressor Knows that there will be no consequence of any substance for their actions.
In most of the iterations of this discussion, some individual will say, "I'm role playing playing a psychopath", except that, they never talk to their victim, they couldn't give you a back story if you offered them cash, and they have no idea what an actual psychopath is. Ask them what the psychopath's motivator is and you can almost hear the vapor lock.
The next "argument" will be that the game allows the behavior. While this is true, it is a red herring when you are discussing motivations. "Why do
you do it?" is not Answered by stating that the rules allow the behavior.
Did I miss anything?