Because
1) they only had PARTIAL DNA. Partial. Othram needs a full sample and so does every other IGG site I know of. That's why they needed Kohberger's dad's DNA (different case, but most of you are familiar with it).
They didn't even have 18 SNP's! Othram uses...600,000.
So here's the problem with even considering this.
How would you feel if your relative (who has uploaded to Othram) is identified as a possible match (and therefore, we turn to regular pedigrees and family lines - as happened in the DeAngelo case) YOU are identified as a possible match. You are contacted by FBI. You try to remember where you were that day that they're interested in. Does this sound like a good way to do law enforcement? No matter what your alibi, you are still on a list of potential suspects and the alibi needs to be really good (you have proof you were not anywhere near the crime, you were at work, with a camera on you, hundreds or thousands of miles away). Now your name is in the LE files (which can become public under various circumstances),
Yikes. If you sent 18 out of 600,000 SNP's to Othram, it would match thousands and thousands of people. Maybe tens of thousands (more likely, really). What is LE supposed to do with that? Attempt to verify alibis for 10,000 people each time there's DNA found somewhere at a crime scene?
Why not do that with the helmet DNA too? And then the bike DNA? (The answer there, I believe, is that the person whose DNA matched those came forward and that cleared him - because he had a reason to have his DNA on the helmet - he sold it to Suzanne).
Does anyone here really think that the bike shop owner in Salida should have been treated as a suspect and should be named publicly (say, by the Defense)? The Defense knows this partial match is bogus and that the person to whom it belongs isn't even a felon and no one has his identity. Perfect Patsy. But tomorrow, that person could be charged with a felony and have his complete DNA put in CODIS, and now...he'd need an alibi. But if his actual DNA is still a partial match - he walks free, it isn't him.
To put it another way, Glovebox Guy is not that sex offender. Glovebox guy only PARTIALLY matches the CODIS sex offender. But does it matter? Glovebox Guy is SOMEONE. Should he be hunted down via IGG? Why?? His whole life turned upside down because a distant relative of his is a sex offender and he touched an owners manual while doing his job? No evidence of criminal activity in the car at all. ALL owners' manuals have some DNA on them that comes from the manufacturing process (so does most underwear, although I will say that many Chinese manufacturers and some in Germany are now trying to prevent employee DNA from getting on products for just these reasons. It's very very expensive to do, though (you exhale your DNA as you breathe, so they have to basically be in space suits).
If that sex offender is found, the CODIS results will still not be a complete match to the Glovebox DNA, because it wasn't a complete match on the 18 markers CODIS uses (I may be off a little on my number there, because I haven't been to CODIS today, it changes once in a while and it makes no difference to this discussion - but others can feel free to try and understand the multi-volume work behind CODIS if they want to, it's quite the rabbit hole.) If the sex offender is apprehended and charged and typical procedure is followed, then his entire profile goes into CODIS (but CODIS STILL won't be using his entire genome to make their match - it's merely an investigative tool, sex offender will match his other crimes - but he will not match the Glovebox Guy's full profile, which is why GG is only a PARTIAL match in the first place.
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