I do not even believe their volume, they look so fake, all those coins that never got even listed suddenly has thousands of them traded for some reason, I can never understand why something that has been around for 6 months and has a total volume (ever) of 100k maybe suddenly getting 15-20k per day, that doesn't add up.
All of this will eventually be shown and why it was like this during this period will be known, aside from that I really don't know what I can say, I believe CEX is our past and present and it will be our future as well, without someone actually taking over the exchange and making some profit, they are not going to keep improving it, if you give people the rights from start they will work harder every day to make more and more profit from it.
Most DEXs are just used by crappy projects that can't pass thru the requirements of CEX.
Though not all of them are crap, but as you can see now in Uniswap, those dead tokens suddenly become DeFi token and now in trading with them.
There are advantages of using the DEX, but at least with centralized exchanges, they are abiding certain regulations from where they are licensed.
Whereas, DEX can disappear anytime they want without getting worried being sued especially if no one knows where they are.
Just choose your exchange where you will trust your funds with. But still don't forget not to store your funds long term in those exchanges, whether DEX or CEX.