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I am talking about the opposite situation. We have more felons' DNAs, but way fewer than used to be in Gedmatch.
Gedmatch is an open database where anyone tested in commercial ancestry systems (e.g., FTDNA, 23@me, Ancestry, MyHeritage), can download his raw DNA, to compare with the relatives tested in other commercial systems. It actually is for genealogy. Free and easy.
However, after GSK was caught using his old DNA and Gedmatch matches, there were questions about the legality or running DNAs of criminals against some people without their knowledge. That led to outflow of clients from Gedmatch. Gedmatch now has migrated on a slightly different platform, transferred all DNAs there (it was mostly done to accommodate new clients tested on V5 chip of 23@me and had nothing to do with GSK or other cases). Now you have to specially "opt in" if you want your DNA be accessible not only to genealogists but to LE as well. Otherwise, your DNA stays in Gedmatch, it can be used to find DNA relatives, but is "invisible" for the LE.
Everyone who is in Gedmatch may answer this question about "opting in" for himself. I usually tell people, if you don't want to make your own DNA "visible", but your older parents/relatives were tested, opting them in is enough.
But there were people who may have downloaded their DNA several years ago, and died afterwards. They can't opt in. They are invisible. Gedmatch changed their rules in March, or April of 2019.
Had the Indiana LE worked with the Parabon since 2017, they'd have better chance at finding matches for the perp's DNA. Now the pool of comparable samples has dwindled.
(And I don't know if they ever worked with the Parabon, or considered it. But the LE did have the time to achieve something through genealogy, in 2017-2018).
So delay might have ruined their familial match DNA chances.