I’ve read of both pre-cruise tour and cruise only cancellations.. There doesn’t seem to be any rhyme or reason to who draws the short straw.
Someone started a poll on a social media site with the initials FB. The only passengers who haven’t reported a cancellation there are suite passengers and those traveling from outside the US. Other than those, there’s a mix of people in large groups, couples, NCL air, cabin type, booking date, etc.