....Money does make us greedy but if we have ethics, we shouldn't promote scams....
Sure, but the criteria for leaving negative trust are (as you know)
You were scammed or you strongly believe that this person is a scammer.
Not:
"I believe this person doesn't conform to my code of ethics".
There aren't very many
proven scams running signature campaigns.
Someone running a sig from a site which others consider likely to be a scam may reasonably say "Until it's proved that they are, why shouldn't I take the money?"
Does that warrant red numbers and a label saying the above?