I heard they sell the results to the NSA....
I didn’t do the medical part of the DNA testing because there’s the possibility that health/life insurance companies can use the knowledge against you. Even if the insurance companies don’t have direct access to your results, if they have a question like, “Do you have any knowledge that you have a predisposition for diseases such as....”, and you answer in the negative when you’ve been told you have the gene for one of the diseases asked about, your policies can be voided if they find out.