The Federal Trade Commission ordered two companies to destroy all the data they illegally collected from children, plus all work product based on such data.

That represents a recognition that the product of collecting data can be morphed into various forms, including algorithms derived from deep learning, and allowing the culprits to retain any form whatsoever of that data would let them make a monkey out of any and all privacy laws.

On the front end, however, this shows how weak US privacy protection is. It protects only children, and that protection disappears when they get "consent". That is not enough.