IEO has been existing for quite some time now, even before Binance organized it's first, but I do not know if it was called IEO, but it is also very much similar to the present form of IEO. Yobit has been a exchange platform for marketing projects for the sales of their tokens, but its reputation has been tainted and nobody, particularly those who are aware, would want to participate in ant IEO on Yobit. There are also some other exchanges that can promote scam projects.