IEO's are much safer than ICO's, especially if done in a good exchange. Exchanges have an image to watch out for, they can't make the mistake of approving bad or scam projects.
The reputable exchanges also want to list the good coins than wasting time with the shitcoin projects. Developers also understand the key facts, they must improve their business idea for listing on the Binance IEO. The big exchanges don't want to list the useless projects, I also agree with their management at this point. Approving bad projects will raise some questions by the social media users(investors) regarding the bad reputation and delisting requests will appear sooner or later. If we compare the IEOs on different exchanges it becomes simple choosing the low reward IEOs. Investors worry about investing in the IEO because there is no guarantee which projects will worth to invest. The low reward IEOs have to be reinstated if the team want to fascinate more investors to the project.