Oh, snap!
The Golden State Killer (whom Patton Oswalt's deceased wife Michelle McNamara wrote a book about) was arrested a few days ago. Most people connected with the case have agreed that McNamara's book was a huge help in narrowing down the evidence and ultimately finding the guy, but today they also admitted that
DNA ancestry sites played a big role as well. (They had the guy's DNA from countless rapes, but didn't know who it belonged to.)
They uploaded the DNA to the sites, received matches from his relatives who had uploaded their data, and thus caught the guy. It's apparently not the first time, and in fact many unsolved cases have already been uploaded, and are just waiting for the murderer's Aunt Edna to submit hers for fun and give them a match.
Privacy concerns be damned; I like it. I can't wait until it's impossible to rape someone because everyone's got a relative in the system.