I’m not sure what you mean. PC games usually run on your PC, unless you’re streaming. It’s the multiplayer server software that run on servers. And the servers are paid for by the company that makes the game, usually. Or the publisher. The actual server hardware is rented from cloud providers, if that’s what you mean. Servers aren’t free, that’s my point. If you want multiplayer online functionality, someone has to pay for the server. And ultimately that cost gets passed on to you, the end user.