Getting a list of emails from a website by guessing a predictable ID gets your house raided by the FBI and a criminal conviction for accessing a computer without authorization [1]. Why isn't fingerprinting treated the same? And I mean exactly the same - first an FBI raid, arrest, and confiscation of computers, and then they get their day in court.
[1] https://en.wikipedia.org/wiki/Goatse_Security#AT&T/iPad_emai...