These seem all very different critiques. The Nick Kristof article is based on the work of Laila Mickelwait, who has for the last couple of years worked tirelessly on her campaign to shutdown Pornhub. I twas her who has surfaced all the victims in the article.

Though I doubt she will succeed now, she is very clear that the end-goal is not to monitor Pornhub, but to criminally charge it's owners. This is because a criminal case against them, similar to Backpage, would essentially make all tube-porn sites legal unviable.