personally, based on their signature campaign, I would hardly use their service. Imo, this campaign damaged their reputation.
Which service are you talking about ? They are not promoting Yobit directly, they are promoting their forum , Cryptotalk and till date they have managed to get the traffic and focus, although by the wrong spamming way.
The purpose of chipmixer and cryptotalk are different. Chipmixer needs investors as when you mix the coins, you pay the fee and spammers will never invest. On the other hand, a forum Cryptotalk need traffic only and no investment from the end users, so even if they choose people to spam, they will still manage to get the traffic.