[danielheath]

> Given that Cloudflare's costs are probably lower than Backblaze for bandwidth, that doesn't seem so unreasonable - but I could be very wrong.

At scale, bandwidth capacity purchases are symmetric - you buy the same amount up as you do down. As a provider of DDOS protection services, Cloudflare has to maintain a huge amount of ingress capacity - meaning they have a ton of egress capacity sitting unused.

[dx034]

According to PeeringDB, they're mostly outbound [1]. I guess they already serve so much traffic that they don't need extra inbound capacity.

[1] https://www.peeringdb.com/asn/13335