

Zero. Upvotes are a show of appreciation and I don’t see why anyone would want that to be private. When it comes to downvotes, if you wouldn’t want someone to know you downvoted something, you can’t stand by that decision and so shouldn’t have downvoted in the first place. Public reactions (alongside the self moderation features) keeps the fediverse honest and prevents the hostile type of downvote spamming you see on other platforms like reddit.

Be as thoughtful as you want to be knowing that if you choose to downvote a whole bunch of comments, someone can know it was you. If someone knows that a single person is downvoting every single one of their comments they can block them if they wish. My main point is just that if you don’t want someone knowing you upvoted or downvoted them, just don’t do it. It would mostly just be trolls who want to hide it anyway