>How would there be a capitalist incentive not to do these things?
Not sure what a capitalist incentive is, but we have plenty of ways to potentially regulate this. Are you asking about technical feasibility of finding the actors responsible for it?
>Do we really need regulations?
Yes.
>Why do these things happen?
Greed/profit motive.
>Why do people think it is acceptable to pollute?
Greed/profit motive.
They finally added a way to easily get the original URL (click the link button in the AMP header). Not ideal, but better than trying to get it out of the address bar.