It's an interesting issue now because norms have changed. That specific privacy view is a very 90's-00's worldview that assumed silos and didn't anticipate using your webmail login for literally everything. Examples include legal firewalls between divisions of banks where they can't use your transaction history to make car insurance decisions. Should an airline know your income before quoting you a fare? (which is why some people use Tor and proxies to search for flights)

Privacy is anti-discrimination, and the reason social media companies are so rich is because they sell micro-discrimination as a service. It's so valuable because when people see how it works they ask, "how is this even legal?"