They probably don't know what actually involves giving away their data and what actually concretely means. I'm a tech guy, developer, here in the Fediverse and neither I do know actually what it means. It's the lack of information the problem. I could imagine it though, but it's not the same thing. I could imagine that with my data big corps become more powerful, creating more addicting ads, contents and algorithms that eventually will fuck up the world even more. And that's a nightmare, I know. Metaphorically it's like intensive farming. "I eat meat because I love it and I can't give up on it" and as soon as no one sees what actually happens to the animals inside those farmings, no one cares.