I would submit that they are no longer highly available or their core userbase has moved on to the "dark web". The genius of the centralized social media platform is that it lives on advertising dollars. The advertisers will pull back whenever a platform becomes too uncontrolled. This was the case when Pewdiepie's accidental Nazi reference video was released. A massive pullback in advertising dollars 'forced' YouTube to reconsider its previously lax content policies and policing. That's not to say that YouTube is some pleasant walled garden, but rather that those creating videos and making real money from the site are incentivized to police their own behavior and rhetoric. Most people talking about 'divisive' content are talking around the Trump/QAnon fiasco. Which is very different from the internet I grew up on where even on a 'kids site' you would often see users calling for outright genocide of specific racial groups.