Well, it's basically just putting the advertising model in automated form, and without the sponsor.
My feeling is that automated upvotes are promotion, and posts that are availed of them should be in the promoted feed. There are ways to parse the source of the promotion fee, if hostile promotion pushing posts into the promoted feed becomes a problem.
The crap producers are really a symptom of the problem, which actually derives from rewards pool mining. It is the delegation dealers that ultimately demanded this code. Stinc is dependent on them, and delivered what it's market wanted.
It's important to remember that Stinc serves a market composed of Steem, not people.
Thanks!