That is not correct. I've used WebRTC data channels myself on iOS and it works fine.

Here's a simple WebRTC DataChannel demo that doesn't work on iOS 12.0 Safari

https://webrtc.github.io/samples/src/content/datachannel/bas...

Since you're not convinced, I looked into it a bit more, and the reason most of the available demos don't work is down to a difference in behaviour between Safari and other browsers, probably to do with address selection for the connection. WebRTC can leak private network configuration in some cases, so Safari seems to be pretty strict in that it requires `getUserMedia` to be called before allowing a data-channel-only to be established.

I made this into a small demo (https://codepen.io/anon/pen/GYrqGL) and you can see after a couple of clicks of 'connect' that a data channel connection is established and works as expected. This is a bit of a privacy/usability tradeoff. But data channels are very much implemented in Safari.

Cheers