I’m thinking for games like RuneScape/old school RuneScape where there are multiple private servers, World of Warcraft, BattleForged (Skylord reborn) etc.
From my understanding the user’s only have access to a downloadable client that they use to connect to the main game server, do people reverse engineer a server with all the server side logic?
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Minecraft, as an example, has a server software, but you don’t even need it. You can open up a game to local LAN. Anyone on the same router as you can play on that world. So you could use a VPN to pretend like you’re on that local network when you’re really not. You can also set up port forwarding (which you have to with the server software anyway) to send all traffic coming externally (as long as it’s addressed properly) to your PC which is hosting the world. Any game that has a local LAN option can be handled this way.
For other/more advanced scenarios, I’ll have to defer to other commenters as I’m no expert on that. But I did teach a class on Ethernet structure, so if you want a guy to go off for an hour on port forwarding, look no further.
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