Are unmarked clothing drop off boxes being used for commercial purposes?

I used to think that all these boxes were for charities, but then I got to wondering why they do not tell who they belong to. I did a Google search and found this

If there is no indication of who is responsible,should we assume that it is a commercial enterprise? There is one of these boxes at my local library. I naively assumed that the box is being used for charitable purposes and put some old clothing in it., Now I am thinking that maybe it is commercially run.