Cool, I'm glad that brought you joy. I wish they gave both of us a check box at the bottom of my spit test to opt in and everyone's happy. But they know at least half of their population would've opted out...
- https://you.23andme.com/user/edit/privacy/
There is also the danger of people having a false sense of privacy by opting out of 1 or 2 genetic tests. This is shared information between relatives and the population at large, not exactly top secret data. The degrees of separation between you and me are 2-3 , so it s very easy to identify people indirectly , hence why it was possible to solve decades-old crimes.
I think our genetic information is less private than the contents of our brains, in general.