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There's a ton of research on consumption patterns of those experiencing symptoms of mental illness, and genes can be good indications of predispositions for those illnesses. There's also research on how social media platforms can induce symptoms of mental illness by tweaking the algorithm that shows content to users.

Not only could platforms use that research to optimize engagement/conversions/etc of those with genetic likelihoods of experiencing such symptoms, but unscrupulous platforms can use those genetic predispositions to algorithmically target and induce symptoms of mental illness in the vulnerable. If a platform knows that a user has a predisposition for overeating or depression, they can then try to lead that user into patterns that will make them sick, with the intention of getting them to engage in the desired behavior of clicking, buying, etc.