This is an example of Parasite SEO. You get a site with high Authority site that you can put some content on (HN/Reddit/Medium/Steemit/GetJar). Then you send a lot (100k+) spammy backlinks and then rank for some difficult terms.
Google doesn't penalise big sites for spammy backlinks compared to a fresh domain, and also with the high authority, it will rank a lot quicker.
A good way to find example of Parasites is to search "Fortnite hack". I can see links from LinkedIn, Steam Workshop and a PDF hosted on a hacked (presumably) website for a roofing company.
I doubt it'll work. Looks like there were some legit responses, and then a bunch of spam.
My guess would be someone testing something.
Huh, even on Reddit this kind of strategy would be trivially detectable.
We noticed that a few minutes ago and banned the account and moved the replies back to their rightful parents.
If you guys notice more duplicate comments appearing in threads, will you please let us know? This was a pain to fix manually, so the sooner the better.