But what about the idea that information MUST BE FREE?
Information wants to be free. The claims refers to any and all of the following facts:
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When information is shared, the sharer loses none of the information.
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The cost of sharing information information is next to nil if not nil. It is an infinite good. In a free market, it's price WILL go down to zero (regardless of whether you think it SHOULD or not).
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Information sharing almost always benefits society.
But must information be free? No, not always. There is value in privacy, for example. So while your DNA information "wants to be free" doesn't mean you should "let it free".
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You might be wondering how there can exist privacy if information wants to be free.
Notice that I said the cost of information will drop to nothing in a free market. Privacy can exist by hindering the market for information deemed private. One means of achieving this is through the creation of laws that (artifically) raise the cost of the information (by imposing penalities for inappropriately sharing and using the information).
Unfortunately, the legal landscape has not yet dealt with DNA sharing in any serious manner. For now, all you can do is hide your DNA. Once it's known by someone else, it's outside your control.