But they already have a giant global community. They now need to sustain it, that's a very different task and one better served by moderation. They are already being out-competed on how extreme a community can be by the various newcomers.

They are the incumbent now, with the incumbent's advantages. What remains to be seen is if they will move to take on the incumbent's responsibilities (which they have done here and there, and seem to be doing more of) or if they'll shirk it (which they did for far too long). In the long term they will make more money in a world that isn't on fire.