I do not understand why top exchanges didn´t adjust the listing fees for the new IEO projects. They still collecting same amount of money like in 2017, but the difference is that investors do not invest even one-tenth of what they invested in 2017. 
And all the exchanges are having record collection on trading fees as the userbase is growing so automatically does the trading fees that the exchanges earn from the users and never should we forget the withdrawal fees that they take, it is always too high compared to a normal transaction form our own private wallet. The ICO hype is over now because of a lot of ICO frauds that happened in 2017 along with the loss of investors by investing in projects that didn't even got listed on the exchanges, because of this IEO offerings were started and those initial ones did a great job and provided handsome returns to the investors.