Wowza. We put an open source nginx cache layer in front, and cloudfront in front of that. It’s a pretty cool setup, but I feel I could do most of the HLS in nginx+ffmpeg.
I am also exploring the webrtc(ingest)-to-llhls. FFMPEG doesn't seem to support llhls now, as it requires web server intelligence. For the webrtc, mediasoup is nice being node based.