It has become a trend now where projects that are always selling with exchanges called IEO will raise funds and secure token guarantees will also be guaranteed if IEO sales on exchanges are successful, therefore IEO is now much in the interest of investors because of guaranteed listing on the exchange.
Not only guaranteed listing but also guaranteed income to those who buy in IEO with those few days pump and selling few days listing in the exchange.
Listing will always become the time to sell and it's not the time to buy because people have already bought before it was not yet getting listed. FYI, the result of listing might be very different with IEO. There was no guarantee for the buyers to get a huge return after listing.