Not saying I do this, necessarily, but friends of mine who are active in policy circles write for various publications under pseudonyms now for this reason. The development of the idea happens in private group chats, where everyone is using their IRL name, but the publication happens under a pen name.
I really don't know if this is a positive change for how policy gets made, but it is happening actively right now.
I understand what you're getting at though. I just made a claim that people in policy circles are writing things under pseudonyms. You want evidence for this (justifiably), but this would require me to essentially out the pen names. Sorry, not going to happen.
Oh, so the pseudonyms appear to be real names, and are not known as pseudonyms? Or are they things like “Cicero.” I wasn’t looking for your contacts as much as I am trying to answer “Are pseudonymously written works more bold/risk-taking etc?”
What happens if someone Googles the pseudonym? Or tries to contact it? Do they use an anonymous email address or just not allow it?
I really don't know if this is a positive change for how policy gets made, but it is happening actively right now.