Unless there is a specific, believable, near term risk people will just ignore it.

Most would submit genetic material to 23andme and similar organizations with no restriction on its use. Yes, if could theoretically backfire not just on them, but also on their kids. But unless they see it as a near-term likelihood they will not care enough. My 2c.

Well, that implies arrogance on their part. And there’s some blame from us too for not warning them enough I guess.

The problem is that there's no concrete thing to point to as to why this would be used against them in the future

(I agree with the point, but it's just not trivial to make people aware of this)

Doesn't the fact that lots of people use Facebook daily despite the scandals say something?

It's abundantly clear that most people don't care about how their data are used. Here "most" means people outside HN.

Lots of people I know completely stopped used Facebook. Some are still on IG though...