The vast majority of revenues brought in by cryptocurrency exchanges are generated through fees on buy and sell orders, as well as withdrawal ...
source https://www.google.com/url?rct=j&sa=t&url=https://www.ccn.com/crypto-exchanges-are-raking-in-billions-in-revenue-despite-market-struggles/&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNET3EJWLsvAZ3XZJd-3pASsZeChLQ
