I read that if you author a downvote it is public information. What other information is public to the network? Are subscriptions public?
You should consider all public. Just the email (if provided) is known only by the admin of your instance. But, afaik, they have no legal requirement to keep it private.
Therefore, consider everything public, including DM, and that’s it.
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Nothing you do on the internet is private. You can remain anonymous on Lemmy by joining an instance that doesn’t require an email, and not using your real name. That’s as close to private as you’re going to get.
PMs could be end-to-end encrypted.
I like lemmies approach of not trying to reinvent the wheel and just let people put their matrix usernames into their profile for secure communication.
