You can call me paranoid, but the first thing I thought of when I heard about it was how excited the Nazis would have been to access a database like that when they came into power. Imagine knowing the names and addresses of whatever Undesirables you wanted to single out, and exactly what percentage of "impure" they were. Ethnic makeup information can also be used against you in things like gerrymandering congressional districts to hand select voters and disenfranchise minorities. It's pretty safe to assume that once your genetic profile has been gathered by a private company, it's vulnerable to all sorts of bad actors gaining access and using that information. Would you want the KKK or the Proud Boys knowing just what percentage black you are? No thanks.