Why did Kraken get sued?

I'm a bit surprised to hear that Kraken is being sued. As a leading cryptocurrency exchange, they have always been known for their robust security measures and compliance with financial regulations. Could you please elaborate on the reasons behind this lawsuit? Was it due to a security breach or some other form of misconduct? I'm also curious to know if this lawsuit could potentially affect Kraken's operations and the trust of its users. Thank you for sharing this information.