It won't. Look at 4chan. It's one of the "free-est" platforms around and it's absolutely full to the brim of garbage that most people do not want to see. Let them build a cesspool for themselves, it's not going to draw a huge crowd as long as well moderated alternatives exist.

All these communications platforms with any significant user base editorialise, even *chan, Parler, darknet sites, etc ven the ones that say they don't. Otherwise they'd be flooded with spam, griefing, child porn, moderate or left wing opinions, etc. That's why spammers have always been advocating for maximalist 'free speech' rights for access to platforms. Given this, it's simply up to each platform owner to determine their editorial policy.