Earlier quoted context omitted.
I read the book and also agree with this. She was the CEO, but he "ran" the company. He also put millions of his own money into it to keep it afloat. He should've been the "adult supervision", so to speak.
I've seen a lot of excuses from CEO's for why they aren't responsible for their actions but "I didn't have adult supervision" takes the cake.
In short, adult supervision should at least be a consideration. Had she be 17 at the start, a difference of a mere two years, that might seem more clear (to some). Legal adulthood at 18 doesn’t confer some magical maturity and wisdom so we shouldn’t regard it much differently than 25-27.
To preempt arguments that this went on without Sunny for some years after she turned 19: 1) Plenty of people with some experience and maturity could have been in her circle of influence before then and 2) I did say age was only a slight mitigating circumstance.