Thoughts
The Green brothers have turned a successful internet phenomenon into a community directed and committed to certain causes, and I wish(ed?)
Monroe would do the same with XKCD. It's weird to make the comparison, because the format of a to-camera youtube video is better for a call-to-action. But Monroe isn't afraid of making comments about political or other causes*, and he has a call-to-action to pre-order his new book. But he's never done a call-to-action for anything else.
*There's a lot of nuance here that I don't want to unpack right now.