“This block was the result of a communication error between Zoom’s domain registrar, Markmonitor, and GoDaddy Registry, which resulted in GoDaddy Registry mistakenly shutting down the zoom.us domain.”
Zoom went down for almost two hours because GoDaddy Registry blocked zoom.us after a miscommunication with Zoom’s registrar. Zoom’s own servers were fine. The fix was a registry lock, which a company Zoom’s size did not have.