Is yobit a shady exchanges, yes but is Cryptotalk a shady forum? Maybe, maybe not. We have no proof yet so we can't conclude.
Like others said there's no active scam accusation against Yobit. They have made bad decisions in past advertising campaigns on this forum, and have paid the price.
I was very careful with my choice of words as i used the word shady which to my understanding means dishonest, untrustworthy etc. Can an exchange be shady and not be a scam?, Probably yes to some extent e.g mercatox exchange could be considered one of those. We have different
references and accusation threads that point towards yobit exchange been shady. It's not in my power to declare them scam besides since the forum doesn't moderate scams guess there's no point debating on this issue.
Mostly what the forum is after is moderating the rate at which spam is been produced on the forum which signature campaign is a major contributor to. The involvement of a manager has minimize that problem to some extent guess that's why the adminstrators of the forum haven't taken action.