The way to deal with this is to constantly do live events, and actually build organizational muscle. Not these massive one off events in an area the tech team has no experience in.
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Unless Netflix eng decides to release a public postmorterm, we can only speculate. In my time organizing small-time live streams, we always had up to 3 parallel "backup" streams (Vimeo, Cloudflare, Livestream). At Netflix's scale, I doubt they could simply summon any of these providers in, but I guess Akamai / Cloudflare would have been up for it.