> If you’re looking for a way to have peer-to-peer multiplayer without setting up your own server, have a look at Steam’s Networking API which also has a Godot integration via GodotSteam, or have a look at the Epic’s NAT P2P API. Both provide NAT hole punching support with relay services as a fallback.

Steam used to work this way iirc, but they now always use a relay. This is user friendly, because with normal peer to peer your IP address is given to other players. DDOSing, bringing down Twitch streams, and all sorts of unfun things can result from that. Of course, this does give steam your users' IP addresses.