this post was submitted on 29 Sep 2023
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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You can't, not effectively. This ain't necessarily a federation problem though, centralised social media has the same problem. You can do the same on Reddit.
That's not to say there aren't things that can be done. Instances can agree to implement shared banlists that include known-abusive IPs or, if an abusive user has a habit of using a pattern in their evasion usernames, you can use a Regex to hunt them out.
On reddit the entire user database is in the hands of one company, so they might be able to tell whether two people are (likely) the same person. So I think that might actually be a problem made worse by federation.
You'd be surprised how hard the task is. Any given identifier can be trivially changed. IP addresses aren't permanent and change frequently for home users. Multiple people genuinely use the same IP. People are likely to have very similar writing styles to someone else by complete coincidence. Browser fingerprinting can be thrown off by simply using another browser or fucking with the User Agent.
That about puts paid to any identifiers either Reddit or an instance owner may have.