DC AG Karl Racine filed a lawsuit over this in May 2021. The judge threw it out, supposedly for lack of evidence that it actually raised prices: https://www.jurist.org/news/2022/03/dc-trial-court-dismisses... I can't find details; it's unclear what the evidence or lack thereof was.
I know that sometimes these lawsuits can take awhile but scheduling something 3 years away seems excessive. It feels like discovery can take months, but years feels like a very long time here especially since this is something that is actively still ongoing and damaging to the victims