DT consensus is very important to make this forum a great place for all of us and kindly educate the young DT to look at the big picture to evaluate the situation.
With more than 500 DT-members, there's never going to be consensus, and I don't think that's necessary either. A decentralized trust system means all DT-members have to use their individual judgement.
That being said, I won't tag them, but I can imagine someone else will.
A person should have due knowledge about the service they are advertising in there signature space, if there signatures promotion is polluting the community, it make the user advertising it untrustworthy too. So wearing a signature is directly advertising the site.
Correct. Unlike real-world advertising, where it's totally "normal" to advertise (almost) any product that pays for it, a signature advertising is much more personal.