When I was younger I learned so much and established many valuable relationships by having discussions on public services/websites. Many legends in the field were quite accessible on public sites and mailing lists. My life would be much worse if I hadn't had those experiences and it feels like a lot of younger people that don't have connections to the SV bubble are now going to miss out on similar experiences.
This isn't to say that we should be tolerant of everything but it definitely feels like we've swung too far in the opposite direction.
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.
What happens if someone Googles the pseudonym? Or tries to contact it? Do they use an anonymous email address or just not allow it?