What would be a good way (Mongo statement, I suppose) to add every user to a group?
I see that all categories are watched by default on NodeBB. Is there a way to disable this setting such that I only get notifications for the categories I watch myself.
No, as at this time, category subscription settings are opt-out, rather than opt-in.
So if I wanted to disable it, I would have to write a custom plugin or something?