Let say if you have masked your IP and browser fingerprint.
You can still be matched with a corresponding usernames based on your writing style.
Here is an experiment conducted by a hn user on hn data: https://news.ycombinator.com/item?id=33755016
This site lets you put in a username and get the users with the most similar writing style to that user. It confirmed several users who I suspected were alts and after informally asking around has identified abandoned accounts of people I know from many years ago. I made this site mostly to show how easy this is and how it can erode online privacy. If some guy with a little bit of Python, and $8 to rent a decent dedicated server for a day can make this, imagine what a company with millions of dollars and a couple dozen PhD linguists could do

On the same day, he closed the site due to privacy concerns (Because it was working too well)
Interesting, I knew there was something like that, but wasn't aware that it was that good at identifying posts.
I guess it makes sense, specially if there are many posts.
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