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@val Personal information is often used in targeted scams and blackmail scenarios. It's a lot easier to pretend to be your doctor, for example, if I know about your health conditions.
In the same vein, the more you know about a person, the easier it gets to impersonate them. So identity theft is another risk.
After data laundering, your DNA data is gold to your insurance company. They can adjust your premium based on how healthy you are, how long you could potentially live, how inclined you are to take risks, etc.
And it's not hard to imagine what a group of violent antisemites can do with a list of Ashkenazi Jews.