I remember reading about this when it first happened. Glad there was at least a somewhat positive outcome.
For reference, here is the HN thread shortly after the arrest: https://news.ycombinator.com/item?id=21000273
Darknet Diaries did an interview with the two pentesters: https://darknetdiaries.com/episode/59/
$600k for 6 years of legal battle and facing felony charges? no bueno