[sp527]

I think he's right. There are so many features you can use to profile and de-anonymize a user, even if you're not running the servers.

People generally don't seem to appreciate the relationship between marginal information and statistical likelihood. ~87% of Americans are identified by DoB, zip code, and gender. That was about two decades ago. The state of the art today is going to make Cambridge Analytica look like the Post Office when it gets pulled out of the shadows.