It depends on the mechanisms that govern atomic arrangements, doesn’t it? If we have infinite time, and infinite space, and if it was an (essentially) random process, then sure. On a long enough timescale, the probability of that arrangment approaches 1. But I don’t think those are the circumstances that we’re dealing with.

Be active in your community, whether that be online or off. People do notice you, even if you’re not sociable.

Why wouldn’t they want to stay? It works for them. Before ideology, before morality, before any other thing you can conceive of is plain, simple convenience. And Reddit is certainly convenient. Once enough users leave, they’ll leave, too.