I did a little searching on FT and did not find anything definitive.

In the states, a hotel generally will ask to see my driver's license when checking in, but that is the extent of it. (Although hotels located within Neptune Township, NJ, must take a copy of your driver's license and maintain it for 1 year per the town ordinance.)

I think we all know that lodging in Europe and at least some parts of Asia require passport information upon check-in. In Europe, it generally seems to be simply entering the passport number in your booking. Or in the case if a Marriott property today in eastern Europe, she simply took a quick look at it (did not leave my hand). Whereas all properties in Asia that I have stayed at have made a copy (although none - from mom/pop guest houses to the IC in Singapore can answer what happens to those copies).

Is there valuable information on a passport that could be used elsewhere? My full name and date of birth are easily obtainable. I don't use a passport when applying for credit. Are there other concerns about copies of passport face pages lying around?

This is a mild curiosity as there is nothing I can do to change the practice.