People cannot access some internet sites, depending on who they have internet connectivity with.
https://blog.cloudflare.com/route-leak-incident-on-october-2... has more information from a previous time this happened. A key idea is that internet routing depends a lot on trust, and it's possible for a single misconfigured site to cause serious issues across the internet.
This wasn't battle damage, this was operator error. Building a tank to survive a war and building it to work when driven in a ditch are not quite the same.
https://blog.cloudflare.com/route-leak-incident-on-october-2... has more information from a previous time this happened. A key idea is that internet routing depends a lot on trust, and it's possible for a single misconfigured site to cause serious issues across the internet.