Each player has a different level of skill, and in some cases, there may be a situation where the duty/content will fail. From the perspective of a skilled player in such a situation, a less skilled player may appear to be "adversarial/uncooperative/apathetic," but even if this is the case, it is not a violation as long as the player is playing appropriately.
For example, the following types of situations fall under the act of giving an advantage to the enemy (or the opposing team/players in PvP content):
"I don't want to heal because there is a player I don't like in the group."
"I don't think we can clear this anyway, so I'll just get hit by the enemy attack and go AFK after I'm knocked out."
"I'm going to join the opposing team as a healer and do nothing so my friends on the other team can win the PvP content."
If a report has been filed and the prohibited activity is confirmed, a penalty will be issued.