Net-net, I think Google's benefits outweigh it's issues. Economic analysis basically backs that up.

I admit I haven't run the numbers on Google, but when I looked at YouTube, requiring human minimum wage moderators to review every video would cost billions of dollars a year - more than the entire site's revenue.

So, sure, Google could drop another 200m on moderation, but I don't think that would get you to full moderation, so you still need algorithms in there somewhere.