so can you give your opinion on whether IEO or ICO will survive on the long run
Frankly, IEOs are just another way for exchanges to scam innocent investors. I still prefer the regular ICO, which stands true to the inherent abilities of the project to raise funds and that in its own way creates a fundamental premise for a project's long term survival. I mean, why would I want to depend on what an exchange thinks about a coin before investing. It's a cheap way to endorse a project and thereby making huge profits off investors.
Ieo's are i think safe and less riskier because exchange is at risk here . we all know that its hard to build reputation if you are an owner of the exchange . ieo investors will tend to choose a project that is already backed by big and popular exchanges such ad binance , houbi and kucoin . though the scamming and frauds are still possible in the future because scamers can always create a dummy exchange to start their own ieo .