Sam Bankman-Fried, commonly know as the "Crypto King" and "The Golden Boy" who was the founder of FTX exchange, was convicted and sentenced to 25 years in prison for for defrauding customers and investors. A New York court gave away that sentence. Further, he needs to forfeit $11bn to compensate victims.
He was one of the youngest billionaire, a billionaire in early 20s, greed and risking people money without consent led him to being sent to jail at the age of 32.

https://www.bbc.com/news/business-68677487