This is not correct. Apple has an inventory, stores, employees in those stores, etc. Likewise, for your other examples, these companies have to hold things on their books like hotel staff, lease payments, building maintenance, etc regardless of demand.
Airbnb is different. When demand drops, their costs directly drop as well since they don't pay hosts for stays that did not happen.
Yes but right now they spend a billion dollars per year on humans doing things. They could tell all or most of them to go home and not come back, and then they wouldnt. But it seems they are placing big bet on this being highly temporary.
The odd thing is that they dont seem to get rid of anyone at all. Most companies use COVID as an excuse for a round of overdue layoffs
Airbnb is different. When demand drops, their costs directly drop as well since they don't pay hosts for stays that did not happen.