Most fraud doesn't revolve around fudging the accounting.
SBF made billions of other people's money disappear into the crypto void without breaking the blockchain.
The idea that blockchain will prevent fraud is naive, absurd and laughable.
It doesn't make judgments about those using it. It works just as well for fraudsters and cyber criminals as anyone else. There are reasons ransomware extortionists always request payment in some sort of blockchain based crypto --- usually bitcoin.
In other words, blockchain *facilitates* fraud and crime as easily as it *prevents* it.