The hacker, Paige A. Thompson a/k/a/ erratic, was a former AWS engineer who abused her access to download the CapitalOne data along with 30 other companies data. Insider attacks are so deadly.
On top of her having insider access, she is mentally ill (hence her fitting online moniker) so that doesn't help any. She was long known about in the hacking scene before the hack. Very aggressive and rude online behavior.
She got convicted recently and her sentencing is in September, looking at 20 years. I think she'll get that. Hopefully she doesn't follow through on her previous statements of wanting to attempt suicide or fleeing the country.