On: In internal memo, Apple addresses concerns around ...

[aoetalks]

I must have the same misunderstanding. I don’t know why this has to be device side for iCloud photos..

[dannyw → aoetalks]

Because security researchers imply Apple eventually plan to turn this on for all local photos, even with icloud turned off.

[stjohnswarts → dannyw]

all local files is what I predict.

[ziml77 → aoetalks]

Maybe because they plan on enabling E2EE for iCloud. Of course that's not necessarily useful given that the set of images yours are being checked against is completely opaque.