Thank you, @Sophia .
@Jennifer4392
Over here, we are required by law to collect ID copies of all adults staying in the accommodation ON OR BEFORE ARRIVAL. And it's completely normal, so it's expected.
One other observation/comparison is that over here, it's perfectly common to have to show ID for things. In fact, we have government-issued ID cards for that purpose.
At the same time, over here I am not aware of the widespread "identity theft" that Americans fear so much. I don't know why that is, but we don't seem to have much of that over here.
So, I sense it's more a matter of what people are used to and comfortable with. Yet, I think any hotel in the US will demand copy of ID (?). So why would it be so unexpected in an Airbnb?
We need to know who is staying in the property for accountability. Is that unreasonable? If they don't like it, then they can always go elsewhere.