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There's a big difference between your own DNA being publicly hosted and identified, and some DNA that is pretty similar to yours but not the same as yours being posted and identified to someone that is not you.

Why should you have a right to block the later from happening? It's not your own personal information.

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I think the difference is much smaller than you think. If someone finds male DNA and my uncle has used this service, and a public photo with my eyes and hair clearly visible in the background on his Facebook page, then suddenly it’s almost as if I registered my DNA in a public registry. It’s the metadata problem all over again, it just takes one or two more public data points to deanonymize it entirely.

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