Taking legal action stops the problem at the source, thus no need for whack-a-mole. The law is less about prevention and more about remedy, because this isn’t Minority Report.
Regardless, if you’re now going to make the argument that Reddit has or “should have” more power to stop this kind of thing than the US legal system, then I’m gonna have to bow out. I’m sorry there’s not a more satisfying answer than the one you’ve gotten. Good luck.