The governments are the ones out to kill you or otherwise materially destroy your life. Corporations just want you to buy stuff.
All preventing private industry from data collection is prevent useful things like this.
And as long as private companies are unable to collect medical data on me and medical confidentiality holds, they won't be able to obtain any such data.
I also certainly don't want some company putting ideas into the heads of my relatives - or my own - about what medicine is appropriate over the advice of medical professionals. The first step would be obtaining data on people's medical condition in the first place, so let's shut it down right there.
They can go directly advertise to doctors who have the required background to actually make an informed decision, but if they trick my gullible grandmother into paying for something that is likely not the optimal treatment, then we have a massive fucking problem.
And that goes for more than just health ads. Most ads are clearly appealing to people emotions instead of rationality: They tell a story of a happy family instead of showing you a fact sheet. They don't exist to "inform" people of their options and help them make a rational decision. If you are going to argue anything else, then I suggest we have a watch party of some randomly selected ads and see whether you can still look me straight in the face, arguing the same, afterwards. Most arguments for the benefits of advertisement are contingent on the idea of the "rational consumer" - as far as I am concerned that ship has sunk and was full of holes to begin with. Even if people were largely qualified to make rational decisions in specialist areas, a sizeable amount likely still wouldn't.
But I don't care as much about people wasting money on some "manscaping" garbage, nose hair trimmer or whatever inferior garbage is currently sold at upmarket prices. So another weasel gets rich? Whatever. It's health where I start to take issue, the weasel grows six legs and becomes something I want to take the boot to.
None. Because it’s done anyway, except in an “anonymized” form. But as we all know, lifting that veil is trivial if you have enough data.
https://www.jewishvirtuallibrary.org/ibm-and-quot-death-s-ca...
"IBM, primarily through its German subsidiary, made Hitler's program of Jewish destruction a technologic mission the company pursued with chilling success. IBM Germany, using its own staff and equipment, designed, executed, and supplied the indispensable technologic assistance Hitler's Third Reich needed to accomplish what had never been done before-the automation of human destruction."
Good job, amoral corporations just wanting to sell stuff.