There's an incredible amount of uses for high quality genealogical data:

-Actuaries/insurance companies: Longevity is largely heritable

-Drug Development/Pharma: The newest drugs are all gene therapies and data sets provide amble grounds for deep neural networks. Identifying potential causes of curable conditions, or identify a marketable consumer base.

-Police/Surveillance: I believe a genealogy database is actually how the Golden State killer was caught.

Certainly there are other use cases, but these are the most obvious to me.