Likely down a few events -
Some players have been finding areas within towns where they can kill pets without the guards being able to get to them due to pathing. I believe GMs have amended this by teleporting Guards to them.
Some people have been bugging Trolls and other spawns by placing houses close to them so they can be solo'ed from the door.
Some players have been soloing bosses for some time by exploiting the fact that they do not fully regen HP when combined with a spiritualist. So portal in, hit, die, repeat.
I think any of these are quite obviously not game intended mechanics. In regards to the last one, the players bragged about it, said themselves they were exploiting it in help chat and a live twitch with Henrik. Stupidity does not even cover the actions of some of these people.