> people could still try to stuff Reddit posts with junk in the hope that it gets picked up by Google in these searches This is already happening. I search for

> people could still try to stuff Reddit posts with junk in the hope that it gets picked up by Google in these searches This is already happening. I search for reviews and help on Reddit via Google often, and it's not that uncommon for the first result to be SEO spam: a Reddit post with no votes or comments, just lots of keywords and a link to a product or another site.