Acosta gave Epstein the sweetheart deal and therefore helped a child rapists get off the hook. A judge ruled the deal itself to have been illegal.
https://lawandcrime.com/high-profile/attorney-federal-prosecutors-seeking-new-info-about-billionaire-pedophile-jeffrey-epstein/
Epstein served 13 months, but he was able to do a work release program six days a week, even though sex offenders didn’t qualify for that.