But if an immigrant has identities that would get them kicked out, disclosing them would just keep them out. And if any of those are readily discoverable, it's probably not worth even trying to get a visa or immigrate.
But if there are ~innocuous identities, it's best to disclose them. Unless there are links to not so innocuous ones.
So if you're going to have numerous identities, it's best to do it right. And maybe then not disclose them.
But still iffy, if you know that you'll likely be emigrating.
It's perfectly possible they'd be allowed in, but either due to a malicious insider or a data breach the information will leak, and someone from the old country will come looking for revenge.
I was arguing that, in those circumstances, perhaps it's not worth taking the risk.
However, many years ago, I went largely offline, as my meatspace identity. I still do some social media with family, but not in English. And for decades, my work was off the record, doing litigation support. I did edit expert reports and legal documents, but most of that isn't public. And in any case, the style is different.
But sure, if you blog and tweet as your meatspace identity, and then have ~anonymous personas using the same language, stylometry could nail you. There is software for protecting against that, however. And it's getting better too.
See, right there you're narrowing the set by leaking your approximate age.
I don't think your opsec is as good as you think it is :)
But Mirimir in some ways is my least anonymous one.
If they ever find even one of those identities, they can legally kick you out forever.
If you even later get citizenship, they can possibly revoke that citizenship and kick you out forever.
It's a pretty big risk there.