im not against decentralized exchange but i use centralized exchange the most especially if im going to trade regularly ( e,g buy and sells bitcoin or ether ) but if im going to stop trading and foccus on bounty and airdrop  ,  i do use decentralized exchange most of the time  and i can see the difference between them  .  dex have its advantages which is security and anonymity while cex do also have its advantages which is the volume and better interface  imho,