To add to this, I recently published a co-authored book chapter. I asked for a pdf copy of the same, and the response was it will be provided only "if you need a soft copy of your chapter for tenure." This is the state of academic publishing in general.
In case anyone is curious about the state of academic journal publishing, I was recently asked for $2,840 out of my own pocket to make a ~4,000-word article open access.