Earlier quoted context omitted.
> Free as in mattress, and free as in piano I don't get it, could you explain?
the mattress could be infected with bedbugs. and a piano that's been unmaintained for enough decades isn't an instrument any more, and never will be. and disposing of them is expensive. they have negative value, despite not costing any money.
I see people trying to sell old Yamaha organs and they lower the price until it becomes "free just take it out of here so I don't have to pay someone to do it."