I’d speculate CFs secret sauce here is working their asses off to negotiate peering arrangements globally, and avoiding paying transit. Then passing on the savings.
You or I can buy transit from e.g. he.net for ~$0.15/mbit/mo. 10Gbit transit @ $1500/mo will transfer 3PB/mo.
3PB egress on AWS = $157,491.11/mo.
And that’s before you take into account you can do settlement free peering at Internet exchanges.