I find the author's claim here both believable (as in it might actually solve the problem) and highly unlikely (giving away what you are selling could be argued

I find the author's claim here both believable (as in it might actually solve the problem) and highly unlikely (giving away what you are selling could be argued to be a business-ending affair): Quote The most important thing that regulators could do is force Facebook and Google — and all data collectors — to disclose their factory output. Give users the ability to see not simply what they put in — which again, Google and Facebook do (and which GDPR requires), but also what comes out after all of the inputs are mixed and matched. End Quote What would this even look like? How could a user even recognize/test that it was about them beyond the things that seem obvious to them?