So then perhaps having a system where if worried about stalking from someone then the government can have a linked account to a "real name pseudonym" - which then the person verifies with, so if that gets leaked in a platform's database - then it's to the fake name.

But yes, ultimately being offline can provide most likely highest level of privacy - and then if wanting to not be connected to any verification system, then there are the myriad of problems like managing out people from bullies to bad actors from network(s) of verified users.