Do you realize that you don't need to volunteer at all? Do you know that there was a rape and murder case that was proven using data from a similar (same?) company? They found a bunch of people with DNA similar to that from the rape kit and went on to find their common relative.

The story above may sound good. But it won't be too hard for medical insurance companies to deduce your approximate genetic profile based on the samples submitted by your relatives.

Even worse, it doesn't take a lot of genetic material these days to profile you. The PCR technique (the same used for Covid-19 screening) can amplify samples. You may have submitted a blood sample at some point in the last few years. How would you know if a tiny bit of that was siphoned off to create an exact genetic profile of yours?