WebRTC mildly competes with their proprietary FaceTime URLs that, along with iMessage, "encourages" people to keep coming back into their stores. They could make it work exactly like the implementations on Windows and Linux (and the other macOS web browsers that are "required" to use WebKit) if they desired. You can still use an SDK though --as long as they allow you publish it to users.
There are native libraries available for both iOS and Android. I didn't want end-user to install any. Just to click the invitation link and start chatting.
I am developing a video chat + screen share for a school. I am looking for similar browser based application "Click to Start" without installing an app or downloading anything.
I use {reactJS,socket.io,simple-peer,nodeJS}. you can skip the reactjs. There are a lot of tutorials available for video chat apps using webrtc+socket.io. https://appr.tc/ is open-sourced but not actively maintained.
