You can see who upvoted and downvoted a post by viewing it in friendica.
schnurrito @ schnurrito @discuss.tchncs.de Posts 177Comments 1,327Joined 2 yr. ago
schnurrito @ schnurrito @discuss.tchncs.de
Posts
177
Comments
1,327
Joined
2 yr. ago
Yes, but then you can have malicious servers sending fake numbers without other server operators being able to check whether this is at all plausible.
(It's still possible for malicious servers to send fake votes, but server operators can see which users they are stated to originate from, then block that server if that looks like it's doing that. At least that is my understanding.)