Real people lost a lot of BTC on Mt Gox, so I'm not sure how the BTC stories are in outer space.
Apart from that, the second half of your first sentence is exactly the question - is fraud endemic to this industry, and actually central to its operation?
The popular perception is that the industry is somehow fundamentally honest with a few bad-actor exceptions.
Considering how regularly fraud happens, how damaging it is, and how rarely it's flagged by auditors and regulators, I think it would be useful to question that view.
Or to invert the polarity - how many significant potential frauds have been prevented by auditors and regulators, or by paperwork theatre like KYC?
Are there any? If so, how do the numbers compare with the number of frauds that blow up into real financial and reputational damage?