Piefed experimented with having a secret account with a randomized name associated with each user, and the secret account would be the one the showed as the source of the vote rather than the real account. Pattern analysis would still reveal who was behind it, and the admins of your source instance could see the link between the real account and the "voting account" behind the scenes.

I don't know the specifics, but if I remember correctly it ended up causing some issues with how activitypub federates stuff I think plus community moderators had some concerns, so the feature was removed.

This is just the nature of the format. I quickly learned the unsubtle art of not caring if random strangers don't like me.