About 10 years ago they provided medical data from the samples. I used 23 And Me too confirm that a health problem I’d recently been diagnosed with was hereditary. At the time I remember being asked if my sample could be used to aid the type of research the OP talks about and I agreed to it.

A couple of years ago, I think 23 And Me was bought out by Virgin Healthcare, at that point I asked them to destroy all my data was worried about it being used to increase the cost of or preclude health insurance.

Is! Yahoo! still! a! thing!?!

I wonder what made youTube decide to fix this loophole? These days the vast majority of people use phone apps or smart TVs to watch. The number of people using Firefox plus ad blockers must be quite small and it’ll be a constant effort to keep updating their anti ad block algorithms.