To be useful, they'd of course need a solution for verifying authenticity of the input data. Otherwise, it's just noise and we already have historical examples of that design failing (such as "informants" handing over people to the US as terror suspects).

>A nefarious genetic catalogue company

Or simply Facebook. Imagine the improvement in advertising accuracy if it could use your DNA as a unique key in its database. Match

Interesting idea, it could even be opt in and explicitly for crime investigation purposes.