I've posted this before but I think anyone who DOESNT name change with frequency for privacy reasons is being naive.
Imagine this fictional scenario :
I have a colleague named Marge. I don't particularly like her but we rub along ok day to day. We have never told each other we use MN.
Marge knows that I like Narcos, she knows that I recently bought a Slow Cooker. She does not know that I had an abortion at 14 or that my DH once walked out in the middle of the night and I sought a handhold at 5am. Nor would I want her to.
One day Marge sees a post I wrote that says my cat went missing whilst I was in the Algarve. She thinks "Oh I wonder if that's Sandra?"
And does an AS, during this finds out all kinds of things and she also finds a thread that everyone laughed at about my bloody colleague Marge and the bins.
I was also on a thread that saw someone outed on their first thread as OP
They were posting about contact for their DSD and covered neither themselves or their DH in glory. Subsequent questions about the set up and the DHs
choices, revealed that the DSD had a half sister whose father was also facing the same challenge and they were helping each other out.
Based on just that description two people posted on the thread who had identified the OP, one of them being the half sisters stepmum.
Outing can happen, it does happen and people are naive to think it's just tinfoilhattery