In your screenshot the profile picture of Ranger looks very different though, could be a very old cached false positive from back when there were code errors if you have been using Nostur since back then, or the pixel checking still needs improvement.
It adds the label if both the following is true:
- you are not following the contact
- it has a 80% similar name and profile picture as someone you already follow
For picture it checks pixels and for name it uses Jaro-Winkler from https://github.com/autozimu/StringMetric.swift I tried levenshtein before but it seemed a bit buggy. Both could probably be improved but I haven't had false positives for a while, there were a few a while back but that was actually related to code errors, not the algorithms.
Discussion
I clear caches regularly. 🤷🏻♂️