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.

It may be that the people most likely to blindly follow astroturfed suggestions don’t pay attention to these indicators. In which case volume is more important than camouflage.