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https://www.vox.com/science-and-health/2018/10/12/17957268/science-ancestry-dna-privacy
All over the world, some 10 million people have had their DNA analyzed by a direct-to-consumer genetics company like 23andMe, Ancestry.com, or MyHeritage.
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So many people have now used the services that many of us don’t even need to share our own DNA to be tracked down. Your father — or perhaps a third cousin whom you’ve never even met — could have uploaded their data, which could lead to you. This is how police cracked the cold case of the “Golden State Killer” earlier this year: An old DNA sample from a crime scene matched with the DNA of the killer’s relatives in public databases, which, after some more sleuthing, led to him.
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The study concludes that around 60 percent of Americans of European descent could be matched to a third cousin or closer relation. And this percentage is only set to grow in the coming years, as more people give their genetic information over to these companies.