Anyone that's used 4chan since 2016, even intermittently, knows how thoroughly astroturfed and shilled it's become. It's a shadow of its former self, and almost entirely comprised of shills now. It's most likely the reason why that single chan remains up, while other the other chans were shut down. After the investigations into the DNC and Podesta emails in 2016, leading to the Pizzagate investigation, and the role that such sites played in the 2016 election, it was obvious that the shilling campaign ramped up against 4chan increasingly over the years. They did the exact same thing to Reddit that year, too, after Hillary won the DNC primary, and the day after Reddit became a "I stand with her" hivemind, after being hardcore Bernie bros that election, and being Ron Paul libertarians before that.