> There is a database of how someone voted.

That cannot be right, that's the fundamental core of the voting process in our democracies. You might be thinking about the party registrations or voluntary polls ?

> You display metadata

What you show to the world has no requirement to be accurate. If you look like a rich 70 old Asian lady when going to the park there will be no check that's actually what you are (unless the police comes at you for an identity check...). That's particularly impacting for gender, you're typically not required to represent your official assignment, and how you behave isn't stuck to your official identity.