Kotaku : Earlier today, I was playing Outriders. I was in the middle of a mission, about to beat a tough enemy, when I was disconnected from the servers. An error message popped up and that was that. But I was playing alone, in an area only filled with NPCs in a game with no PVP. So why did I even need to be online?

Source: N4G PC Games Like Outriders Really Need Offline Modes