I'm gonna turn this meme into a book. I've got some other obligations to attend to presently, but this idea will be simmering.
Because its an NPC peasant whos had enough of Players busting into his home, stealing his sweetroll and acting like nothings wrong.
So any book from an NPC pov should have Online in the title? Even if it's a PC game, and not an online one?
There's no hard and fast rule. It's just something a few of the early authors did and a lot of people copied. Makes it a bit more evident it's about a game. Awaken Online, Ascend Online, et al.