If you understand legal and privacy issues, you know why this is such dumb idea. 1/
Supply infrastructure for it?
Maintain it?
Secure it?
Address the obvious legal issues that will come from those seeking to be removed from it?
These are serious questions and can't be answered with "we'll figure that out." Because we won't. 2/
Sometimes "we have to do something" ends up causing more issues than it solves. That's certainly the case with a central DB. 4/4