People don't realize the magnitude of the information that they're giving away. They also don't read the TOS/Privacy Policies so they don't realize they're often giving ownership of their data.
I think it's important to remember that people can say one thing and intend to act in accordance with that, but do otherwise out of ignorance. Of course, however, that's not always the case.
> what people say and what they do are usually 2 different things.
True. Progress in that area can be a factor. I know some people who understood right away the risk from submitting DNA and some people who took time to absorb it.
Alternatively, it can be 2 different people. I know people who dismissed the risk as inconsequential. The folks I'm thinking of also maintained eagerness to aid LEO.