I remember working in performance for a company that was building video delivery systems. That was about 10 years ago, but I still remember the celebration of 80Gbps, that was when we could deliver live HD quality events to about 5000 downstream customers using one such device. That was the hardware capacity of the platform that was used at that point.I guess that technology evolved since then, but even so serving 1M customers shouldn’t need more than 200 instances. My wild guess is that Netflix either didn’t autoscale or that the rebalancing/anycast mechanism didn’t work properly.