Cloud option for Select Subject: what is uploaded and what happens to that information?

I just learned from Matt-K that I can get a better Subject Selection by enabling the Cloud option. My question is two-fold, (a) does the the image get uploaded to Adobe for this, and (b) if so, what does Adobe do with it afterwards? Do they keep any uploaded images for any period of time, claim any rights to them?

Note, I do not store any files in the Adobe Cloud - this does not appear to be necessary for using the Subject Selection tool. I don't want to sound paranoid, but then again Adobe did leak my email address in the breach they had some years ago.

Thanks, Adriaan