I don't know the right number but I do know of at least 2 acquaintances who lost all their families life savings. The legal process to get the money back is actually still ongoing but during that time we changed our national currency to euros and those life savings are worth about 10% of what they were back then.

Thing is, with crypto you invest (usually) what you can afford to lose and you accept the risk. With banks most people think it's safe and risk-free so then the impact of losing it all is so much harder, it ruins lives.