[inciampati]

It's super easy to find out whose is whose. To get hacked this way all you'd have to do is leave the house.

[nikcub]

Similar to the different concerns between mass surveillance and targeted surveillance

It's easy to link a database and profile millions of people. It's much higher effort for them to come and get my DNA.

[Faark]

And they likely don't have to get your specific DNA. Just have to find a single willing relative.