This is the same approach that getstream.io (disclaimer, my startup) and agora.io take for video calling. A global edge network with support for SFU cascading is optimal for the call quality.
The Cloudflare Calls launch post is really well written! But I agree that it perhaps somewhat overstates the uniqueness of their approach, given that Agora, Jitsi-as-a-Service, Stream, and Daily all offer WebRTC platforms with a mesh/cascading SFU architecture. Relatedly, I didn't know that Stream had launched SFU cascading. That's awesome! I'd love to compare notes sometime if you're up for it. (I'm a co-founder of…
That sounds fun, @tschellenbach on twitter or the email in my profile