I've been thinking about this feature & was unsure how it could be implemented & how useful it would be.

The way Nostr is designed, it's an expensive calculation to derive a personalised, dynamic indicator of trust for an npub.

A trust score could be progressively calculated when viewing a profile based on how the npubs you interact with interact with the target npub.

You could also use a ai bot/DVM to do this calculation for you & send you a report once done. I also tend to think that this would be the best way to tackle it.

I'm very selective about the npubs I follow & this feature would be very beneficial to me. I would pay a DVM a nominal fee to do the work for me.