Why printers add secret tracking dots (2020)

If I hack a printer to have it add an invisible code to documents, that I then use to track down its owner, that would be a criminal act. Except if I built the printer and added the backdoor in the factory. But if the owner of the printer tries to remove this backdoor, they run into my DRM, and breaking it makes them the criminal.

Are manufacturers simply exempt from laws, by virtue of having built something? Can they impose their will on others, and have the law prevent any kind of push back, by that same virtue? Items are treated as still belonging to their manufacturer, and buyers are reduced from owners to mere users.