[tpush]

> Clientside scanning will happen even without iCloud.

Again, you don't know that. "Scanning" (whatever that even means) non-iCloud photos would be completely pointless.

And you said:

> The only reason to do this clientside when the data is already readable on the server is to do it to images that aren't hitting the cloud.

Again, you don't know that at all. You present your speculation as the "only reason" with no knowledge at all.