But it's nonconsensual, contrary to the laws and contract.

Should or shouldn't in general, but THIS one database shouldn't.

Yeah, as long as all 500,000 people in the data set agreed for it to be public then thats fine. But how do we verify that?

They're on the list, their information is out there. Isn't that what 'opt in' means?

That's a quite.... astonishing* take.

If I leak your medical information you confidentially shared it with your doctor that means you are okay with it because you opted in for that?

Or does the scope / details do not matter for others, but only matter for your data.

*I have much better word but I guess I should say it.

When i signed up as a volunteer they assured me it was not going to be public, only veted researchers allowed to access it.