4. IEO don't fail on this exchange because the team do their own research on projects before listing
IEO may not fail but are they keeping up the price above the ICOs?
Can all IEO from Binance stay on the exchange for a 4 year cycle without been delisted? It will take sometime to prove this
No one can tell because even if you do saw those projects are still doing well at the moment, it will matter only on the demand and time will come neither it would be proven out
or would just ending up the same into those most projects in the market that eventually die after years of existence due to lack of demand and interest.