Ever since Bitcoin launched back in 2009, the rise of centralized exchanges has been inevitable. A few years later, and now the whole crypto market is dominated by centralized exchanges. While there have been many alternatives to the solution (such as decentralized exchanges), people are still performing trades at centralized entities.
The main reason for people flooding into centralized exchange is the ease of use and nothing else, there are some local exchanges in government controlled countries where they are set up as a centralized exchange but they are allowing users to purchase and sell the coins using P2P method where the centralized exchange acts as an escrow service and the security features in the decentralized exchange we now have is not that great as we have already seen many hacks and these may the reason we do not see much volume in those exchanges.