This is one of the issues that makes web of trust such a challenging problem to solve.

Here’s a crazy idea: instead of a signature that proves Alice made some statement (could be a rating or whatever), have some system that utilizes a signature that proves [some user on this list of users] made the statement. Alice would be on the list but her privacy would be protected to some extent.

I presume there’s a way to do this cryptographically although I’ve not investigated how exactly to do it. ZKPs perhaps.

Example: the list could be a list of people who are part of the Nixon Administration. The statement could be one made by Deep Throat (Mark Felt) regarding Watergate. The digital signature would prove that someone in the administration made the statement, thereby removing the need for the world to trust the reporter (Carl Bernstein).

Or the list could be users who fit some demographic, and the statement could be a rating of some particular product marketed to that demographic, so Alice could provide useful info (possibly in exchange for some sats) while protecting her privacy (not perfectly, but pretty well).

There are ways a bad actor might try to abuse this which would be worthy of consideration. Not sure how significant that would be.