So a single large address block is of little use to such an organization, unless they get to announce more specifics all over the place.
This seems to imply several things: - when having lots of sites, you typically want to obtain local Internet connectivity, because transporting all the traffic over links or VPNs is a pretty heavy business
this is an assertion which many have claimed is false. based on empericial evidence.
- you don't want to backhaul all the traffic in the internal network / VPNs, so you'll either need to announce a lot of more specifics or use IP addresses from local internet providers
this is also an assertion based on false premise.
Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings