Several years back now, one of my colleagues was very much into the genealogy thing. She had major problems I think with needing to find herself or where she fit in or whatever. She was very much pushing me to try one of the DNA genealogy testing services and I had to be very firm about not wanting to participate in it.
This is why. My sense of self has never been in question and I don't need to attribute who or what I am to some people I've never met or culture I haven't participated in or been a part of. I have been considered "other" my whole life by in groups who only wanted me to identify with the bits and pieces of my culture or personality that they approved of and I pretty much had to get over that at a young age in order to not feel inadequate or content with myself.
As a result these always seemed like services that over promise and under deliver and they ask for way more privileged information than I am comfortable with giving away to anyone (I was skeptical when my doctor wanted me to participate in cancer screening via DNA testing because the only angle I could see for wanting it that would be profitable to an insurance firm was to deny me coverage later). Every time something hits the media about a leak or mismanagement of customer data, I am vindicated in my belief that it's not worth the price of admission.
