Apparently, they were a dominant player in this space, such that its shutdown impacted such a wide array of significant-sized companies, from ZenDesk to TaskRabbit to Meetup. Even more surprising is that they were part of YC (W15), and yet from what I can tell, have only had one significant mention on HN from 3 years ago (65 upvotes, 11 comments)
https://news.ycombinator.com/item?id=9758464
I would've guessed that Smyte would've been the kind of Silicon Valley business that was made for media hype (what with all the attention/criticism given to fake news and Google/FB/Twitter moderation). Then again, it does seem that content moderation -- important as it may be -- isn't a field as sexy as AI/deep-learning and other forms of automation.