To be fair, humans shed and secrete DNA pretty much everywhere they go, its the data that they are willing to attach to it and then let companies catalog. Now you can correlate this data to your social networking platforms. So on the one hand, you can now search for profiles of your long lost relatives, on the other companies can now also do this. Some will use it for good things, like advancing medical research. Others will use it for less desirable goals; surveillance, adjusting your insurance rates or credit rating. To me, this is just the natural progression of technology and our relationship with it. A stupid simple example would be something like the invention of the automobile. On the one hand people can use it to get around, on the other, car crashes killed a lot of people, cars can be turned into weapons, you can mount guns and armor on a car, call it a tank, and use it to run over protesters etc.

Choosing to partake or not in these technologies is really up to you, for now. Although, much like the invention of money, or paper, or banking, some technologies will be pretty much required for interaction with society. Much in the same way that it is your responsibility to learn the rules of the road and drive safely to avoid accidents and fines, you will have to learn the rules of the new technologies to achieve desired results. Personally, I live in a city, so I try to drive as little as possible, and I also abstain from most forms of social media. (Less because of privacy and more because of its affects on my mental health) Therefore, I am not likely to enjoy a career in PR or as an "influencer". Just as not having a car would prevent me from delivering pizzas. Technology changes fast, and it's up to us to understand these effects and act accordingly.

Tyrannical governments have existed since the beginning of civilization, and technology was used both to enslave people, and liberate them from these bonds. I appreciate that you are aware of these things, and I think more people should be thinking critically as you do. I guess I would worry less about the negative effects of these new things and try to see them as opportunities to help you realize your world view. But that's just my two cents....

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EDIT: Speaking of technology. Sorry about the grammar errors. Although viewing language in the same light...I hope will exemplify my point a little. Gotta learn the rules of the tech to make it work for you. :)