[systoll]

Because the Zoom web client doesn't support end-to-end encrypted calls. Only their apps do.

https://support.zoom.us/hc/en-us/articles/360048660871-End-t...

[lxgr]

That can‘t be why – one benefit of their weird way of using WebRTC is that it would actually allow them to provide end to end encryption in all browsers, regardless of support for WebRTC insertable streams.