Unfortunately, the GPL (and similar AGPL used by the software in question) is pretty toothless. If they wanted to spend the money to persue this in court, pretty much all they can get out of it is them coming into compliance with the license. If they are a great tech company that invested significant engineering effort to actually improve the software, that would be worth something.
However, I doubt that is the case. Whatever tweaks they made are likely not even worth the effort of reviewing, so even pursuing license compliance doesn’t have a real upside. This is why you rarely see GPL enforced.
It depends on how you count. Jones is unlikely to ever pay the full value of his debts, so the value of the victims forgoing their portion should be discounted proportionally.
I would comment on how the calculation was actually done, but federal courts do not allow for public recordings, and this court does not appear to make it’s written orders public either.