I made an informed decision when I signed up.

It's SNP genotyping, which realistically other than telling your ancestry and few health conditions, isn't that predictive of most health conditions. Genotyping only captures a small percentage of total genetic information (it's not a full sequence -- still too expensive for what I paid), and thus the data was actually very limited, so the risk was realistically very small.

Privacy is about risk-reward -- rather than applying the preventative principle to everything (which is overly conservative), we make trade offs in life.