Including some of the most private (and immutable) data of 15 million people.

«Genetic data is immutable and can reveal very personal details about you and your family members.»

This shows, that data that has been exposed and/or collected once, will be available to anyone with money or hacking skills.
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https://www.eff.org/deeplinks/2024/10/sale-23andmes-data-would-be-bad-privacy-heres-what-customers-can-do