system
A chat on subreddit /r/wallstreetbets
human
I don't know if you've been replied to about this but from what i understand, the whole porn thing was in response to child porn on the website.  It had become a haven for them because of the way tumblr works.  Apparently they either had to rework the way tumblr works entirely or create a system to auto flag and ban nudity so that they could get rid of the child porn.  So they were pretty much screwed.

gpt
Wow, so they shut it down instead!