lots of discussion about dex and cex exchange here... cex, the most popular ones are all still centralized to this day. include: binance, kraken, bitmex, bithumb, huobi, cb pro, and many many others. Recently, the canadian based quadriga CX has supposedly lost 190 million dollars in customers funds. this is just proof that holding your coins on a centralized crypto exchange is not the best idea... just let us trade in unitrade:)