I agree, hence my earlier suggestion:If you're asking me: there's no 'exactly' about it.
If the implicit suggestion is 'maybe don't accept money from sketchy vendors', then attention can be paid to which vendors might be thought to sketchy, and some consideration could be given to whether that sponsor is worth taking money from in light of what that might do to the public perception of the site.
There's no algorithm -- it is just paying attention to the issue.
I don't claim to speak for the OP, but it looked like you were asking me.
"the individual that bought the coral document the complaint on the vendors thread and ask for a response. Issues like that build up and will, hopefully, provide that accountability you are looking for without R2R having to be the coral name police."
I seem to be coming off as an **** tonight. My apologies.