Demand forms a proposal. There are a lot of projects that are willing to pay millions in order to list on big centralized exchanges. For most of them listing on Binance or Bittrex is the only chance to pump coin price, after what the team will be able to dump their share. Exchanges know that and therefore they have lost their shame and the greed took over them.
Decentralize exchanges should fix this. And actually we can see that step by step focus is shifting from CEX to DEX