Most of the DTs who ~ each other dont do it because they actually distrust them, its done because of disagreements or falling outs.
exclusions aren't
just about whether you trust someone (eg in a trade). they indicate whether you trust someone else's judgment (eg about their inclusions) and their use of feedback.
anarchist societies practice ostracization as a non-violent means to encourage good behavior and discourage bad behavior. that's all TECSHARE is encouraging---the use of non-violent consensus to ostracize bad actors. this is the only say that individuals have in a group that operates by general consensus.
And then, do you know the trust system is meant to be a subjective system?
humans are subjective, no escaping that. does that mean we can't strive towards objective standards?