I think this doesn't have much to do with classifying, but more with the fact that DT feedback would be directly visible, which is Vod's intention based on what he feels is right. Making others aware of certain things.
Most probably don't care about leaving feedback if they're a) not on default trust list and b) not directly affected. But as some users apparently did leave feedback regardless of a) and b), despite them knowing it wouldn't be directly visible, Vod sort of said "thank you" to those who did because it helped him spot things with less work.
Not every hole is a pigeon hole

At least that's how I got it.