If votes became truly public
There’s no ‘if’, they already are.
what would stop a malicious user from automating crawling the fediverse to get a list of every up and down vote a targeted user has ever made?
The same thing currently stopping them: nothing but time and effort.
Admins can currently do this, I assume given enough time and intent? Yuck.
No, anybody can currently do this.
That’s the issue with decentralisation. The info is out there. It’s that or trust a megacorp with it.
It’s about fashion designs. Your buzzwords have about as much relevance here as they usually do in any startup pitch - which is to say, absolutely none.