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MMORPGs generally tend to involve PVE and PVP interation.
in a proper mmorpg focussed on open world gameplaye rather than instances, there is only 1 environment (the game world) in which the players exist in. in PVE the players interact with this environment and they shape it with gameplay choices. The environment is in effect a product of player descisions. SInce every player is interacting with the same environment, they are effectively interacting with players or the results of players descisions. This sounds awefully like PVP to me.
in a real mmorpg PVE is also PVP.
grinding 50 boars for their hides and exp.might seem like a purely PVE task but think about the implications. there is no 50 fewer boars for someone else to grind for exp. the price of boar hides has also just gone down because you have increased supply. your actions have just made everyone out there with boar hides a bit poorer.