That's a great question. The idea behind decentralized exchanges doesn't seem bad, but for now, it's not even a competition, as centralized exchanges are obviously dominant. I was trying to find some data, and at least based on what
Coingecko is tracking, 24-hour volume of decentralized exchanges is a mere 12 billion USD out of 86 billion USD globally. So it's just a share of around 15%. And so far, I don't see why that would change in the future.
That's not even DEX, honestly $12 Billion 24 hours volume is high and I'm not surprising to see that, because people are encouraged to use them. Like new listed coins, they first get listed on swap platforms instead of centralized exchanges, many people like to buy new listed coins in order to earn huge if the project goes big.
This is different with bisq, robosats, and any other sites listed on kycnot.me, they're not used to buy new listed coins, instead for privacy and most people don't care with privacy.