Definitely I don't know and see who can say that IEOs are safe due to the ongoing rumors that some exchanges are involving in the game of ICOs back in the year of 2017, some fake exchanges are causing hype among the community and shouldn't be welcome like the ICOs. Personally , I only believed in some reputable exchanges that I have used before.
maybe now IEO is making an interest because it has a relationship with IEO now maybe you should trust more with some exchanges like binance that support IEO and it can be used as one of the trusted things and there is no fraud in IEO