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. 
the quality and brand of each exchange are different, because of that the fee will be different. however, I think that every project has the opportunity to list on popular markets, it's just that they don't want to work on it and are quickly satisfied when their tokens have been traded on several unpopular exchanges.