I don't think all the scams and fraud are an accident. It's hard to not cynically feel like cryptocurrency has always been scams all the way down. The bare distributed consensus algorithms are scams: Proof of Work is a wild lottery that would be illegal under certain lottery laws in US if the output was US Dollars instead of, say, Bitcoin. Proof of Stake doesn't fix the more problematic lottery aspects, it just adds a "Rich Gets Richer, People with More Money Get More Tickets" scam on top.
Premining was a massive heist scam at the beginning of the ledger, available for all to see the evidence of it. Bitcoin's legitimacy hedges a lot on that promise that those early wallets are inaccessible. There's never any certainty on that promise, especially in the way Satoshi is a mythologized figure that maybe never existed or maybe is one of a handful of known scammers claiming to be him. It shouldn't be a shock how many ICOs were premining scams when that lies at the heart of Bitcoin.
I feel like even the name "blockchain" is a form of fraud at the center of cryptocurrencies. The data structure is clearly a Merkle tree. "Forks" in the chains aren't an accident or an aberration, they are a natural shape of the data structure and all the handwaving and "yeah, but Proof of Work and coalitions of miners and majority ownership" sociopolitical contrivances don't fix the technical fact that these things are trees, always have been, and always will be. (How many Bitcoin forks are we up to being tracked in the major exchanges now? 6 was the last I counted, months back. And at least 3 Ethereum forks. Those numbers aren't "accidents", that's not an aberration from the norm, that is clearly the norm and the earliest forks were all long ago enough now that most people have only known them as trees and never actually "singular chains".)
Again, I know I've got a very cynical view of all this, and I know not everyone agrees with my views on the above, but they say scammers can often recognize their own, and when so many scams have happened on top of cryptocurrencies, it is very hard not to wonder: When even the technology and terminology resemble scams and frauds, is it any real surprise how many scams and frauds keep getting run on top of them?