If I were adopted or perhaps the result of Fertility treatments, that I may be interested, but as far as I know I am the natural child of both my parents.
There have been so many cases of scientist using data collected for one thing for quite another and truth be told I do not trust that the data will be kept private. There have been so many data breaches over the years, that I am not going to give a company my DNA.
I also find it creepy that a company would 'connect' me with others saying they were long lost relatives. Is that something you opt into?