I do not see him in the DT network with ";dt" which means his feedbacks are not making any difference in the trust scoring.

It makes sense where you are coming from. And with this definition if every one of us starts making our own rules then how things will not mess up?

Let's say hypothetically:
nullius finds a way to tag users who shit-post
eddie13 finds a way to tag users for plagiarizing
suchmoon finds a way to tag users for not agreeing with them in an argument
The Pharmacist finds a way to tag users for multi accounting (even if the accounts are not abusing common rules)
examplens finds a way to tag users who he thinks are not leaving valid feedback
OgNasty finds a way to tag users who favour Vod
Vod finds a way to tag the users who favour OgNasty
Royse777 finds a way to tag a user who distrust them

How will we handle all these?
Clearly there will be no standard, no agreement with each others but a mess up all over.