I don't mean to sound smug, but I'm the author of the Jackbox Games multiplayer servers, I regularly handle hundreds of thousands of simultaneous websocket connections from players' phones. I can't for the life of me find a server implementation of webrtc data channels that I would actually put into production. I've seen a few blog posts with toy examples, but nothing that is ready for production. It sounds nice in theory, but try actually finding a production-ready server implementation of WebRTC data channels. I would LOVE to find a documented example of doing client-server communication with WebRTC data channels (a Go implementation on the server specifically). I've found no such thing. Every few months I search and don't find such a thing, and I don't need the extra few ms of latency improvement badly enough that it would be worth the engineering time to author it myself. If you know of one that's actually ready for primetime, I'd love to hear about it.

edit: after writing this comment, I did some snooping around since I haven't snooped around on this topic in a few months, this looks promising, unclear how widely used people are using it for production work: https://github.com/pion/webrtc