I think the best example is for women. Imagine they can figure out, with 95% accuracy or something, that you are pregnant, that could be valuable data.
Now imagine you are a woman at a large corporation who just got pregnant, but aren’t telling anyone yet. Too early. Your corporation buys a batch of data and discovers there is a 95% chance you are pregnant. They don’t want to pay for maternity leave or make reasonable accomodations during pregnancy or pumping breast milk. They fire you for “unrelated reasons”, before you ever tell them you are pregnant.
Nothing illegal happened there really. You never told them so you have no way to prove they fired you for that.