New Hampshire Public Radio put out an amazing podcast about a murder that went unsolved for decades. A lot of effort by a lot of people went into unraveling the stories and identifying the victims, but genetic genealogy was pretty key. In the later episodes they also talk a bit about the question of unrestricted access and the consent of people in the databases.

If you're interested in how powerful the techniques are (or are simply interested in how a very cold case was finally broken open), I'd highly encourage you to check out Bear Brook:

https://www.bearbrookpodcast.com/

I hope I've kept this vague enough to avoid giving anything away for anybody who wants to go listen. It really is worth your time.