I think you got the use case of such edge caches wrong. You don't get one of those for a single app. Most companies who participate in such edge cache programs

I think you got the use case of such edge caches wrong. You don't get one of those for a single app. Most companies who participate in such edge cache programs don't even have apps. These are boxes that internet service providers plug into their networks, usually close to their customers, hence the name "edge cache". The edge cache owner then routes user requests for big and static content (video streams, large apps, OS updates, stuff like that) coming from networks equipped with edge caches to the caches located within their networks instead of a third-party CDN or the cache owners own server farms, effectively reducing the traffic that particular ISP has to route through to the edge cache owner. It is this aggregate traffic that has to meet a 25Gbps peak minimum to qualify for getting an Apple edge cache.