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Reddit will warn users who repeatedly upvote banned content
(www.theverge.com)
This is a most excellent place for technology news and articles.
Or just open the thread on an mbin instance. Here's everyone that upvoted this thread.
Edit: Downvotes (reduces) are less exposed, but as you said, someone can just run a fedi instance that exposes them to everyone.
Piefed upvotes are private though
Only for untrusted instances iirc.
I just tried to check this by looking at one of rimu's (piefed's dev) posts and indeed I can see upvotes by piefed.social users from kbin.earth. They're real usernames too, not just randomly generated ones like I've seen proposed in one discussion on private voting.