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Because it’s reassigning someone’s gender - e.g. making a female body look more like a man’s. We don’t have the technology to change someone’s biological sex, but we can help them by giving them a body that more closely resembles their gender identity.
Just proposing a way to incentivise the sharing you wanted. If you want this kind of thing to be public domain so everyone can take advantage of it then the public needs to pay for the research to happen.