That's actually a nice idea. Build a metric that can be pluggedjin to clients showing the nostr-of-trust score.
Discussion
Nostrgram.co is already using a similar "web of trust" model where it assigns a number to each person in your timeline based on if you follow them, if they follow you and how many of your followers/followees follow them, etc. The higher the more "trustworthy".
ie: You're a 13 to me. Here's what it looks like:
