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.
I went to uni in the mid 90s when Y2K prep was all the rage, went back to do another degree 20 years later. It was interesting to see the graffiti in the CS toilets. Two digits up to about 1996, four digits for a decade, then back to two.