Ok so this may be a dumb question...but now do you handle ISP outages due to storms and stuff with on prem solutions? I'd imagine large datacenters have much more sophisticated and reliable internet connections than say an Xfinity business customer, but maybe that's wrong.
Much more sophisticated and reliable than Xfinity.
Good datacenters have redundant and physically separated power and communication from different providers.
Also, in case something catastrophic happens at one datacenter, the author mentions they are peered to another datacenter in a different country, as another layer of redundancy. Cloudflare handles their ingress, so such a catastrophic event wouldn't likely to be noticed by their customers.