To address your point of x’ing out of the checklist: display an option at some point where the user ports the entire follows list into a “trust in all things” list. Make it easy and painless. That’s just to jumpstart the system. When Alice later realizes she doesn’t actually trust Bob in category X, that’s when she discovers she can provide an updated attestation to that effect.
Discussion
btw I took a quick look at anigma.io and I was wondering how channels work? Are new channels stored as nostr events? If yes, what kind are you using?