I think we have pretty good evidence in recent years that this is not how things really work. Those filters and algorithmic steering just provides a way to keep people in their bubble. What you’re describing is basically what YouTube was: allow anything legal but use sophisticated software to show people what they’ll respond to positively. The radicalization this led to is well documented at this point.
I’m not really in favor of what CloudFlare’s done here, but it’s really a fact of basic statistics that exposing the mainstream to well-made propaganda is far more dangerous than exposing radicals to the mainstream.
Imagine 1% of non-radicalized people exposed to radicalism become dangerous and 50% of radicalized people are de-radicalized by exposure to the mainstream (laughably optimistic). If you start with 100 million non-radicals and 500 thousand radicals, you have a 125% increase in radicalization.
This is how we now have so many flat earthers. When you have massive reach, it’s easy to grow your numbers.