

This is a foundational restriction with how federation works and was discussed back during the exodus from reddit when they cut off their API. Votes can’t be federated without identity attached, or you’d end up with a single vote multiplied by however many instances federated it to yours.
This is the price of the fediverse being uncensorable. Everything you do on it is oublic, and norhing can be reliably deleted from the entire fediverse.
There was some efforts to obsfucate voting by one of the m/kbin lemmy alternatives, to have each account have an associated hidden account with a randomly generated name that would technically be the account used for voting, so only the admin of your own instance could connect between your public account identity and your voting identity, but that could also just be defeated by basic pattern identification.
As far as instance admins are concerned, this has been known from the start, and is completely outside of their control. That said, it could definitely use some more signposting for awareness. It’s shocking how often this entire discussion gets repeated by people who apparently never thought to look into how federation actually works.
Reminder: Their database has been shown to keep the last version of a comment as well as the current version, and they have repeatedly used this to restore deleted and edited comments.
It would also be trivial for them to keep more previous revisions than that, and to just flag “deleted” comments to not show to users while still keeping them for use in AI training.
The best option is to stop using Reddit entirely.