I confess that I don't see why the question is off-topic either. If you'll pardon my saying so, it is ill-worded and unclear, and perhaps this was the problem. Let me see if reformulation helps.
The situation is clear enough in outline:
- Busy Times Square crush
- Suddenly, all the giant TV screens fritz and show an empty Nevada road
- A message appears, reading, "Submit"
- All the TV screens fall to the ground, with all the damage entailed
The question is:
- How might major earth organizations respond to this in the short term?
- Apart from sending emergency personnel, how would the City of New York respond? Would they plead for calm, demand revenge, point fingers at hypothetical enemies (Al-Qaeda, for instance), or what?
- How would major news services respond?
- How would the state and federal governments reply?
- How might foreign news services present the same information?
- Video of what happened will go viral, leading to all kinds of instant armchair "experts" with more or less elaborate theories about the event... like what?
None of this has anything to do with what actually happened. It's a matter of thinking through how our current world functions to make a series of reasonable projections. This is stuff the FBI, CIA, and lots of others do routinely. Surely that is worldbuilding?
What would clearly be off topic would be asking such questions as
- How should I have my characters respond?
- What do you think would be a good cause for this effect?
But I see this question as about projecting realistic short-term responses from large and relatively predictable organizations and their spokespeople. So I would say it needs rewriting but then should be re-opened.