Too much money to be made
This data set is way to valuable for the confidentiality interests of the public to have any impact. Sure, they will say soothing things but the reality is that your personal mediacal data will be out there and identifiable for those willing to pay for it. Just point me at the process to opt out of hving my data shared, and I will sign up as I did with care data, and recommend all my family do the same.