What is the state of art to anonymize data for AI ? I know numerai does this for stock markets (using homomorphic encryption or a loose version of it). What is

What is the state of art to anonymize data for AI ? I know numerai does this for stock markets (using homomorphic encryption or a loose version of it). What is the state of art of research on this ? Google and Microsoft are trying something around this https://www.technologyreview.com/s/601294/microsoft-and-google-want-to-let-artificial-intelligence-loose-on-our-most-private-data/ https://www.technologyreview.com/s/601294/microsoft-and-goog...