I stopped thinking of my DNA as a secret when I realized how impossible it is to keep other people from having access to it. Once someone knows it, you cannot change it like a password.
DNA is an anti-secret. You share it everywhere you go and cannot stop. It's no more secret or personal than your shoe size or height.
My DNA isn't a secret, but I don't yet feel comfortable voluntarily handing it over to be indexed by a for profit company that has little to no regulation over what they can do with it.
I have not done these services because while I would be comfortable accepting the consequences in my remaining years, I have no idea what that would mean downstream for my living relatives, especially my son.
US federal law prohibits this [1].
They could easily frame this as "hey 80% of the population who are pretty healthy -- do you like paying extra high rates for this small population of people with a predisposition for really rare, complicated diseases? if we drop this unfair law we could lower your rates by X%".
Not saying it's right or ethical, but that I wouldn't be shocked if healthcare started lobbying hard to get this tweaked.
The interesting thing about modern genetics is that it turns out everybody has some elevated risk for some disease or condition, which means the vast majority of people have an interest in prohibiting genetic discrimination.
The idea isn't 100% security or nothing, but to make it harder for the data to be exploited.
Lots of our personal data isn't a well kept secret, but I also don't give it to any company that asks for it, unlike my shoe size.
That's like called open source contributors suckers, as it gives away their labor for free and makes them more susceptible to copyright and patent litigation. Maybe so, but the world is better off for it.
Genetic research is important but pick the lab carefully.