you also decentralize diversifying using several exchanges (regardless they are centralized or not); decentralized exchanges can be scams and existing ones are gaining thrust very slowly since they are of/from no-one and therefore if you do not do KYC you also cannot KnowYourServiceProviderExchange better than centralized ones, they core values and even if they are supporting opposite values to your owns. Baby steps, as in BTC each person/node owns his own truth until the big picture is betters understood and new choices can be done in your own trust/confidence alone.