He lost untold billions of dollars (admittedly off his giant pile of even more untold billions of dollars).

He’s the primary controlling shareholder and defacto owner. What other kind of accountability would make any sense at all? Even if he fired himself, he’d either have to shut the company down, or find someone to replace him and manage them, which makes him their boss.

Edit: to correct dumb statement around share ownership. But you know what I meant.