The online sub system doesn’t handle actual hosting, you still have to host it. Steam is for things such as saving cloud data, friends lists, achievements, etc. You choose a server (digital ocean, whatever) to host on, and then you forward the ports on that server. As long as your game is being ran as a dedicated server and your users aren’t hosting the games you’re fine. Only the person who is getting the connections (the current “server”) has to port forward.
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