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This article sounds like an advertisement.

I know Aaron. I find it highly unlikely this is an ad.

Agree. He mentioned 23andMe waaaaaaaay too many times for this not to be an ad.

Is there anything that prevents 23andMe from selling the genetic data they collect?

Nope. Which is why I refuse to use services like theirs.

I found my biological family through them. Mother, father two brothers, nieces and nephews and an aunt. Definitely woth it for me.