ICO, IEO, ITO, IDO, they are same but adapts with a new name for a new trend. The basic instinct of those crowdfunding is similar, only different on name and the way the market calls it.
that's right, it's just a designation, so basically it still has the same function. for investors there will be no problem with ICO, IEO, IDO, ITO and so on. they are more focused on the research project that will be the launch target. so they can earn big profits. simple aja, without the need to question the name presale.