YSK: Your Lemmy activities (e.g. downvotes) are far from private
Edit: obligatory explanation (thanks mods for squaring me away)...
What you see via the UI isn't "all that exists". Unlike Reddit, where everything is a black box, there are a lot more eyeballs who can see "under the hood". Any instance admin, proper or rogue, gets a ton of information that users won't normally see. The attached example demonstrates that while users will only see upvote/downvote tallies, admins can see who actually performed those actions.
Edit: To clarify, not just YOUR instance admin gets this info. This is ANY instance admin across the Fediverse.
I have actually been really surprised by the amount of anti free speech and anti privacy attitudes that I have seen since joining Lemmy. It seems that a lot of the people that made Reddit the shit hole that it was, are the ones who have been early adopters of Lemmy.
God I miss Voat, that was true free speech with a heavy emphasis on privacy.