The issue is that it's impossible to run a viable user generated site without some moderation. The difference between 4chan & 8chan is some level of moderation

The issue is that it's impossible to run a viable user generated site without some moderation. The difference between 4chan & 8chan is some level of moderation (in addition to removing illegal content). Although less extreme, conspiracy theories and fake news are bad PR for social media platforms & thus impact their bottom line. Additionally, many platforms currently are under pressure from investors and ad-networks to maintain certain standards.