In the context of this post, it's bigger than that. Eve would be a government employee who can likely make new "human" profiles for Mal instead of using her own. Any centralized "human" identification system so we can vouch for a single entity-identity would probably be either run by the government or indirectly controlled by it (someone has to be able to input birth/death records at least, and countries like China aren't going to let e.g. Worldcoin operate within their borders unless they can control accounts).
Spam bots would use stolen/purchased credentials and get shut down. State-level bots would be free.
Most countries don't even have accurate population figures, let alone an accurate list of who is and isn't on there, even if you assumed they wanted to operate openly with no corruption and perfect intentions.
The only thing you could do is build an identity from scratch, karma as you will, but then if it was actually valuable people would sell that (see rich people buying high-powered gaming accounts for the lolz etc)