Adding site:reddit.com to searches improves the chances you'll get a result that is not totally wrong or spam because reddit has a built-in moderation system (upvotes/downvotes). The community also has little tolerance for SEO clone and other junk sites.
It's not perfect -- there are definitely gamed topics and bullshitters -- but it's light years better than default Google. I don't think I've ever seen a clone of StackOverflow appear on an upvoted reddit post or comment while I see those sites every day on Google.
I agree with you on the risks of that feedback loop. I'm hopeful that humans will still be around to moderate information on forums.