I believe in Crypto, but have less than zero faith in "Big Crypto"
The whole point of the tech is that centralized players are simply not needed. Why did an engineer design a system where they're not needed? Because they commit fraud whenever given a chance. Greed and ignorance is what reinstalled them into the stack.
There are plenty of ways to commit fraud with fully decentralized protocols. For example, build in a well hidden backdoor, and then steal all the users funds with it (via a good VPN of course, so nobody knows it was you, and you can publicly claim you were hacked).
I have USD or EUR. I want BTC or ETH. To sell my USD or EUR in exchange for BTC or ETH, I use a centralised exchange. Then I immediately transfer the BTC or ETH that I bought to a wallet that I control.
The whole point of the tech is that centralized players are simply not needed. Why did an engineer design a system where they're not needed? Because they commit fraud whenever given a chance. Greed and ignorance is what reinstalled them into the stack.