I see most comments concentrated on employment. For a scam, think of someone that has been told they have a specific genetic disease, and that information is available in their DNA "data". As a scammer, I can start to send you information about alternative health treatments specific to your disease, that have no scientific backing to them. Since I'm a scammer, I can write anything I want to, like stating that the information is backed by FDA approval and even put statements like that in the fine print to build up my credibility. You could also try and sell fake services that wipe your released DNA information from databases online. There's a lot of potential for scams if you can link what people think is private (DNA), and their email/personal information.

When I was younger, I read a lot of ethics course material, and spent a lot of time thinking about how someone could get around existing laws or technology, and most of it boils down to most people believing what they're told with a bit of coaxing (building that credibility; social engineering). Luckily, I never went ahead using this information, and have actually turned down projects where my morals were put into question, but I think it prepared me to be more conscious of scams and shady advertising. I work for a digital advertising agency, and use an adblocker during my development work so I can see how a site is useful or mostly worthless when someone turns ad networks/tracking off. One of the benefits of working for a smaller company.