I don't think the main reason behind Yobit campaign's punishment lie on its spamming encouragement. It involves shady behaviors of this exchange (if not scam):
I beg to differ, I believe it's more of the spamming than shady business, have you seen the statistics of the increase of posts (which most are spam) after the introduction of the signature? If I can recall clearly I read somewhere (tried retracing but can't find it) that yobit or any project are always welcome to advertise on the forum as far they don't or make their participants to break any forum rules (believing that statement was made by theymos himself)