The largest providers use CDNs to serve content, which are designed to be redundant and resilient. Cloudflare alone has 335 datacenters on all inhabited continents. Services that don’t need to talk to a single centralised server would be fine.
You are forgetting that those data centres talk to each other using those cables in order to actually have a local copy that they send to the end user.
This caching behaviour will cease to exist if there is no internet connection between the centres.
The largest providers use CDNs to serve content, which are designed to be redundant and resilient. Cloudflare alone has 335 datacenters on all inhabited continents. Services that don’t need to talk to a single centralised server would be fine.
You are forgetting that those data centres talk to each other using those cables in order to actually have a local copy that they send to the end user.
This caching behaviour will cease to exist if there is no internet connection between the centres.