I don't think it's unfounded, since once these companies have your DNA, they can keep it forever, share it, or even lose it in a data breach, and presumably ove

I don't think it's unfounded, since once these companies have your DNA, they can keep it forever, share it, or even lose it in a data breach, and presumably over the next years/decades we will be able to make DNA information about you significantly more valuable. In general there doesn't yet appear to be common significant gains that can be made from the DNA tests available. Sometimes you will be lucky and find you're at high risk of certain things, but the vast majority of the information won't help you much. You still need to eat and exercise well either way. Until this changes, and we can actually do a decent job of offering personal recommendations based off of one's DNA, you're likely better off getting a lot of blood tests and working from there.