Similar happened with an article for self-promotion on Imgur, and honestly I'm almost not sure why people found it acceptable for there to be accounts dedicated to selling and hyping. Even stuff that looks very formulaic or is like $300+, plus deleting+reposting if their post isn't successful and other questionable stuff like that.
Etsy aside, there even were (well, still I guess) successful multi-million dollar game publishers that had multiple accounts pushing crowd-funding and early-access games (and I'm pretty sure the actual devs were burned by publishers, particularly if they were encouraged/coerced to handle their own online marketing).
In either case it seemed way too oversaturated, I gotta imagine much of them weren't actually successful.