I think the items listed under "What astroturfing would look like" were a pretty narrow scope. If I were designing a ~spam system~ astroturfing solution, I'd engineer out these four simple indicators as soon as I could.

* Those accounts naming one brand almost every time they name any. * Thin accounts: few comments, low scores, no real standing in the subreddit. * Young accounts, or accounts with histories that are hidden or wiped. * Links to a store or an affiliate page.