Every user exists on a spectrum of engagement & activity.  So any WoT will need user input, and I think profile level labels might be too broad, but really, most users won't engage at all.

Unless... "trust engagement" is made a first class citizen of consuming a post.  Posts are immutable, but people change all the time, so the trust should be tagged to posts to be most effective.

Naively, a swipe left/right feed could maybe generate some good insights, as users are forced to make a binary choice at every post 🤷‍♂️ 

 I think what you’re leaning towards is dynamic trust scores based on content not user. But, this just ultimately boils down to a user score. If people like your content and don’t forget to label it, it would just add to your credibility or subtract from it. 

 A content score doesn't "boil down" by itself to a user score.  Users or clients who want a simpler WoT can boil it down and lose some precision in their modeling, but settling for less granularity across the board seems retarded in the literal sense