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> Of course, this does give steam your users' IP addresses.

A rendezvous is unavoidable, even for UDP P2P. The hole puncher server would be the rendezvous -- or the STUN (P2P) / TURN (TCP) server if you wanted to make the smarter choice and use an existing protocol. Either way, the rendezvous gets the IP no matter what.

The only way to avoid leaking the IP to some middle party is to use port forwarding and manual communication of the IP.

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IIRC, Twilio offers a paid STUN/TURN service. But you could also self-host it using some open source TURN server, since all it requires is a public IP address (with the caveat of course that it might not be geographically close to the end user).

>The only way to avoid leaking the IP to some middle party is to use port forwarding and manual communication of the IP.

You're responding to someone who is concerned that the enemy player is going to cheat and your suggestion is to straight up tell him what to DoS?

I'm responding to the bit about steam.

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