Peak traffic is very expensive to run, because you're building capacity that will be empty/unsused when the event ends. Who'd pay for that? That's why it's tricky and that's why Akamai charges these insane prices for live streaming.

A "public" secret in that network layer is usually not redundant in your datacenter even if it's promised. To have redundant network you'd need to double your investment and it'll seat idle of at 50% max capacity. For 2hr downtime per year when you restart the high-capacity routers it's not cost efficient for most clients.