Earlier quoted context omitted.
There are billions of addresses in the world and you can look it up online. It is an identifying information only when it is attached to an identity. That's exactly the same. DNA is everywhere, it's only identifying when connected to an identity.
It can be tied to your identity, that's the point. Because they'll have your relatives' data.
So yes, there's a risk but its not much different from going outside and leave behind hair or saliva unaccounted for. That's Putin level of paranoia IMHO(he is known to have men collecting his poo etc. when outside).
Maybe can be useful for insurance companies to match you and price you according to your DNA but they are not allowed to do that and they can only exist within legal structure.