I mean where they spend the money is irrelevant.
So it’s ok to pay money for infrastructure for your car to use, but when you have to pay for the infrastructure for your video games it’s robbery? Now I feel like you’re the one being arbitrary.
PC has had online multiplayer since the creation of the internet
This tells me you weren’t around for the early days of PC gaming. On the contrary, PC gaming went through a couple phases when it came to online multiplayer. Early multiplayer games often didn’t have matchmaking or dedicated server discovery at all, then there was the Gamespy era where a bunch of games delegated their multiplayer matchmaking to a third party with limited functionality and ads unless you paid a premium subscription.
It was the game consoles that really fixed multiplayer early on with their party systems that persisted outside of each game. Today Steam has similar functionality, but Valve is just eating those costs, just as Sony used to. Difference is Valve doesn’t have to sell you your computer at a loss, they they can have loss leaders like that in different areas.