Cloudflare only has access to DNS requests made to their resolvers, not the amount of bandwidth utilized (which would certainly push Netflix and YouTube up) or the number of requests made. They also have some vaguely defined fudge factors to their rankings.

To take a guess at why Apple is so high, I think bundling all of these together might help their rank:

- App store downloads

- iOS updates

- Apple TV+ streaming

- Services that iOS / tvOS / macOS devices utilize

- Apple Music / iTunes downloads

- iCloud (including Private Relay and related traffic)