I think this whole fear is over blown anyway. I am in a genetic out group (schizoaffective disorder and yes my risk is genetic) and the benefits of getting my genetics run twice out weighed any risk that might have befallen me.
You have no control over your genes.
It turns out that it's more valuable for advertisers to learn if you actually smoke, than that you have a genetic propensity for smoking. Your genotype is just useful for figuring out your phenotype, and in the vast majority of cases, your genetics (especially not at the resolution offered by 23andMe) are not a shortcut to learn your behavior, which is what they're really after.
You're probably already classed as some variety of paranoid/dissident for your careful social media preferences...
If you have to change your habits because a secret system is watching over you it means they are already controlling you.
You cannot hide your bank account, where you drive, what you buy, and on and on and on.
And all I need to get your DNA is pick up a cup you drank from or go through your garbage.