A great question wearytraveler and one that I can only answer with other than the obvious......they don't care at all!!
Some of the foam pillows I've seen I wouldn't try to use as a foot rest. I remember a stay a year ago now that had foam pillows in the closet that looked horrid. We called to request some foam pillows and the reply was something like "look in the closet and you'll find them". Well that didn't go over too well with the Mrs., so we said we have and don't wish to use them so how about some fresh pillows. First attempt we got feather, second attempt we go foam and they were actually OK! Shouldn't have to go through such an action to simply get what you request in my opinion.