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They do have a web client, but not WebRTC. See this reverse engineering of their protocol: https://webrtchacks.com/zoom-avoids-using-webrtc/

TBH I don't really understand their rationale. Nothing about it strikes me as "better" than WebRTC.

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To allow meeting participants to use the web client to connect to a meeting requires the meeting host to explicitly enable the option in their advanced settings (it is disabled by default).

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