This smells like something happened with MarkMonitor, they accidently flagged zoom.us as brand spoofing and filed copyright complaint with GoDaddy who runs .us TLD. GoDaddy suspended the domain per the complaint.
replies(3):
Since when did we accept, as a society, guilty until proven innocent? I recognize GoDaddy is not the government - but this is unacceptable. A human spending 3 seconds looking at the domain would understand it's a false-positive and should not be removed.