Decentralized exchanges are not perfect, but neither are they wide open to abuse like a centralized exchange is.

Many so called "hacks" on exchanges are in fact exit scams.

A DEX will not cure this right away, but it will help .. a lot .. especially if used carefully. There will be DEX hacks, there will be DEX scams .. but the chances are greater of an honest experience

There are issues, there are partial solutions.

One of the self defeating characteristics of a DEX is revenue. A centralized exhange can fund tech, marketing, hype, partnerships - all the things decentralization usually offer when you get economies of scale. This will happen one day with a DEX and if it manages its revenue streams well they may take off.

Meanwhile you will get "centralized DEX" jumping in to muddy the water (say Binance DEX) as they see the writing is on the cards unless they can confuse the market place