I for one had never heard of "InvestBox" before yesterday, and there was no warning or notice given to anybody, yahoo62278 included, before YoBit change the signature. Regardless, again, it is our responsibility to vet projects on behalf of spammers. If you are going to advertise a product, it is your responsibility to find out what you are advertising.
I myself never new about the allegations against Yobit until doing a bit of further research today after the new signature came out. I knew of late payments during the campaign and that was about it. Proper criticism would not be to claim anyone that now removes the signature is hypocritical but rather careless in doing due diligence. I mean, I've removed it now so was it careless not to do research on it? Sure, I'll concede that. Question remains though if default trust members will tag those promoting Yobit's 10X. Kind of a gray area.
My two cents - Revert back to the old signature. I know Yahoo already inquired about it to the admins so hopefully they'll make the adjustment. I personally would not store my BTC on Yobit, but if someone is advertising the forum Cryptotalk.org on their signature, I don't think that warrants an untrustworthy rating.