I was a really early subscriber and right off the bat saw that it was the best place on the website to agitate. Agitating online is important because it's the modern equivalent of worker pubs. On there we can make an esoteric social argument that redditors reject outright because it's otherwise benignly reactionary. We can make an esoteric economic argument that is shut down by all the temporarily-embarrassed millionaires and cryptobros on the website. There usually isn't much penetration with either in most subreddits.

In a place like r/collapse, everyone has a visceral connection to what's happening and an intuitive sense of what's coming/what caused it. That can just as easily be hijacked by eco-fascists with more convenient options where scared people get to do nothing. Hippies can hijack it like they did the rage of the 1960s, with eco-centric communes and incoherent utopias and empty hedonism. Liberals can manage it as a place of recuperation like they do Extinction Rebellion. When we're in there, it's easy to link dots and channel anger into something constructive or at least destructive toward the right thing. You can show the practical necessity of organisation because they know the future is being held hostage and that top-down solutions are the hopium of the masses. Even if people aren't won over there, the arguments you refine there are the ones you'll be making in any setting as things get worse.

And because it's not overtly political it's less likely to get banned than consciously socialist subreddits.