Comment by thinkingemote

So what can Apple do with this assuming they can send anything not just "landmarks".

What metadata about the image do they get?

Are images from the web or social media or device screenshots accessible too?

Seems at the very least they are getting a database of things, objects and shapes. Can cohorts of users be identified? Useful for ad targeting?

They should be able to determine how many devices have a photo of a particular person. Or have a photo of a piece of art. Useful for capturing wanted people and stolen goods! They should see how many times users take a photo of another phone. When and how many users take a photo of a protest. Which side has which colour. Do people take selfies of themselves when sick with a novel pandemic.

Do people take more photos of dogs at Christmas than cats.

Anything that can be vectorized can be identified. But what data do they get and what could they do with it?

It's like telemetry and database of images.