So what's next, Hacker News is illegal because the point system encourages retention?
But we still don't let liquor stores sell to kids. We still criminalize a lot of drug use. And while there are tons of different opinions about whether specific instances of those restrictions are appropriate, pretty much everyone agrees that there are qualitative differences between predatory behavior-influencing and bad choices.
It's a question about where to move lines that society already broadly agreed to put in place, not about whether to have lines at all a la "well you might as well just make bad choices illegal then". We already do that, and it succeeds at mitigating harm in many (not all) cases.