I think a better approach would be to exclude those "accounts with bad trust lists" directly rather than exclude the person's "sponsor". I bet there are some questionable characters in many DT2 members' networks if we look two levels down (DT3/DT4 essentially).
We all "collude" in Meta all day long. I just "colluded" with marlboroza above on how I think a trust list can be built and he's probably gonna disagree with me anyway - that's pretty much exactly what was going on in that Russian thread that triggered most of those red trusts.
Yes, but what if I had quickseller(xenon131) in my list(hypothetically speaking)? Would you vote for me then and put me into your trust list, or anyone else? I don't think so.
These accounts actually did this, they added someone who had quickseller to their trust list. And some accounts excluded some other accounts for unknown reasons.