They chose mass-growth of the subreddit as a tool for advertising SRA over ideology and that worked for a good while but it became detrimental and they did nothing.

In their defence I suspect they don’t really have anyone on board the knows how to conduct a proper purge either. Ideally it would occur over several months and be conducted as silently as possible so as to not attract the neoliberal wrecker crowds who will pose as socialists and attempt to cause exoduses and drama in the community. The org membership touches grass whereas keeping this shit out requires people that completely immerse themselves in very-online reddit rubbish.