According to the report published Monday, investment fraud was the most pervasive – and expensive – type of crypto-related fraud in 2023. Of the more than 69,000 reports of crypto-related crime the agency received last year, nearly half were reports of investment fraud, and investment fraudsters made off with a whopping $4 billion. And while crypto crimes only made up about 10% of the complaints the FBI received, the $5.6 billion figure was roughly half the overall loss by complainants.