YSK: Your Lemmy activities (e.g. downvotes) are far from private
i.imgur.com
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.
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kbin has the ability to see activity including upvotes, boosts, and downvotes from the UI for entries, comments, and microblogs
I was about to call OP out as a liar but I didn't realise this was specific to kbin.
The same data is also there on lemmy, there just isn't an UI element to display it. That's why op said admins can see it, but on Kbin users can too.