Most crypto traders make use of centralized trading platforms, like Binance, Bitmex, Poloniex, Bittrex etc
The hype around these platforms made it appear to most guys in the cryptospace as the only available option, very small percentage of the crypto traders population have an idea on how decentralized trading platforms works.
Obviously centralized trading platforms are easy to use and all that! , but thats not the best the technology can offer, I believe the future lies in decentralization, with that we can achieve maximum security. Personally i trade on a decentralized platform, because i got tired of the issues surrounding the centralized systems.
Most people use it because it is easy, it does not change the way they behave online. People are used to : signing up for an account with an email, and password, that they can recover if they forget.
Ask yourself, how many crypto people actually know how to keep their own private keys. How many traders actually ever made a manual spend, put up the fees, sign the transaction and broadcast? Probably very very few. These guys are just speculators. Traders and what not. They are not interested in crypto or blockchain. If leaves and stones one day can go x1000, they will trade leaves and stones on a platform. Guaranteed.