I agree that shutting down a games servers while leaving a singplayer mode still can be a bad move and will give team fortress 2 as an example.
- people can buy cosmetics in the game, but some may only buy them for their appearance on the multiplayer servers to other players
- 90% of the games depth with strategy comes from competing with other humans
- the bots in the singleplayer mode of the game are quite stupid, especially if you play as a spy
No other gaming company seems to do as much for open source as Valve. Microsoft finances its closed source XBox platform, Sony does the same with Playstation. Epic? Nope.