There is nothing wrong with the article (from memory, I read it some time ago), the problem is going from "there is a small minority of users who abuse user-generated content platforms" to "zomg, this platform is a horrible and encouraging all sorts of illegal things!" One does not follow from the other. The problem with the article isn't that it exposed a problem, that part was excellent journalism, the problem is also that it advocated for all sorts of companies to boycot PornHub, as well as being laced with a kind of accusatory attitude towards PornHub I don't much care for, almost as if PornHub themselves uploaded the videos.
The same problem exists on YouTube, Twitter, reddit, and even Hacker News to some degree. Of course, being a text-only platform makes the scope a lot less dramatic, but I've seen some people advocate for violence against certain groups and the like. I'm sure dang can tell you about some of the horrible things he's had to ban people for.
This is a difficult problem to solve, I don't really have a good solution for this, I'm not sure if anyone does. I do know that private companies acting solely in their own interest acting as custodians of what is and isn't allowed based on what does and doesn't generate "negative publicity" is most definitely not a good solution.
How often do we see "{YouTube,Apple,Google,...} blocked my account and is threatening by business and I don't have a good recourse"-stories on HN? Too often, and those are just the ones that manage to get publicity. There is often no good recourse to address mistakes or really get a good impartial judgement on things that might be on the border.
You might say "these are private companies and can reject the customers they want, you don't have a right to do business with them", well, fundamentally I don't really disagree with that, but a lot of these companies are monopolies or duopolies they can really have a big impact and even make basic participation incredibly hard or even impossible. Sometimes that's not a bad thing, but again, it doesn't seem to me that we really want to leave it up to private companies acting in their own interest to make these kind of decisions.