Comment by LarsDu88

I had direct knowledge of this. To clarify I believe 23andMe did not give direct access to individual's DNA data.

What 23andMe was selling to GSK was the results of GWAS (Genome Wide Association Study) results, which could be used to generate therapeutic candidates.

GWAS is a sort of rudimentary machine learning algorithm that basically maps a phenotype (like propensity for a particular disease) to a region of DNA. From there the drug company can narrow down candidate genes to attempt to develop specific drugs for.