On a semi-related note. When I was a kid my parents used to make us quit our gaming session with little to no warning. This wasn't a big issue with single player games because they can be saved/paused, but that's obviously not possible with online multiplayer games. Unfortunately, that didn't matter to them, and it resulted in many interrupted gaming sessions and unnecessary consequences and behavioral issues from me and my siblings.
Now that I'm a parent, I've made a promise to my kids that I will always let them finish their current game before kicking them off. If they start a new game after they've been given the last game warning, then there's consequences. They know this, and we rarely have any issues related to behavior and gaming.