I don't know if the day of reckoning will be anytime soon. I think a lot of major advertising firms are aware that they're mostly serving to bots, but if they tell their customers that, they don't get paid.

edit: This has definitely soured my already poor opinion of reddit. I mostly post there about video games, or to help people in /r/buildapc or /r/askculinary. I think I'd rather help people somewhere I'm not going to get blackholed because an AI misinterpreted my comments.