I wouldn't define a CDN as edge computing either, since computation is not the purpose of a CDN.

https://en.wikipedia.org/wiki/Content_delivery_network contains

> Most CDN providers will provide their services over a varying, defined, set of PoPs [...]. These sets of PoPs can be called "edges", "edge nodes" or "edge networks" as they would be the closest edge of CDN assets to the end user"

There's also https://en.wikipedia.org/wiki/Edge_device which uses yet another idea of what The Edge is (in this case routers to a bigger network)

So "Edge" is the new "Cloud". Got it.