I actually know a few crypto enthusiasts who claim to use DEXes. When pressed further, you realise that it’s to avoid KYC/AML and taxes, not for decentralization principles…
In other words, "decentralization" is just a talking/selling point that evaporates on closer inspection down where the rubber really meets the road in the crypto market.
By going all crypto, you're rejecting fiat central bankers with some transparency and oversight in favor of crypto central bankers who have none.
For crypto people, the problem with 2008 wasn't that big banks got bailed out on tax payer's dime, the problem is that they as individuals weren't the ones getting the bailout