7 points
It’s not really possible to have an upvote counter without storing who voted, so your instance admin would always know
10 points
There are cryptographic methods to do this, but it’s probably not worth it to implement them for this.
3 points
*
Honestly, not implementing anonymous voting probably helps with preventing brigading, too. Reddit worldnews (around the api debacle began) became a nightmare of downvote bots towards anything that wasn’t “Israel = good” in any way, and so many spam articles upvoted to the surface from random, unverified sources.
Edit to add: threat of defederation towards communities allowing or encouraging this behavior would probably be better, though.
