I do not know because investing in 2018 I think many have failed and suffered losses, but in 2019 I really found the best investment to date, I followed some IEO in Binance let's say Harmony and Kava gave big profits to the participants and it is proof that the best investment is still in IEO, but in my opinion many ICOs don't trust now.
IEO has always been positively appreciated by investors and some big exchanges like Binance, Kucoin, Gate often bring a lot of great profits to investors. In fact, in order to participate in the IEO projects proposed by this exchange, you need to follow the rules of exchange and rely heavily on luck. Over the past 5 months IEO has been an investment that you should consider more because the opportunity to earn double profits will become easier.