Genzedong is another big communist sub purged by reddit. My guess is reddit will start to end when even "softer" leftist and anarchist subs start to get banned, such as r/latestagecapitalism and r/piracy. This coupled with overall enshitfication will lead to mass abandonment of the platform, which will allow for a place like lemmy to replace reddit in the consciousness of society. Things tend to get destroyed when capital and profit become the main justification for them to exist; but it may take some years for that destruction to happen.