How useful are at-home DNA tests?

No, but no one’s forcing him to submit his saliva. The only way he has to allow them to “get hold of my data” is if he wants his DNA analyzed by them.

That’s pretty clearly indicating a desire to utilize the company’s service, but an aversion to the specific business model. Whether there’s any model that would allow people to get results without using those results to provide results to other people is an open question.
Powers &8^]

A positive development here in Honolulu when two lifelong friends in their 70s learned they were actually blood brothers. Or at least half brothers. Same mother. There’s a chance they had the same father too, and I hear they’re looking into that.