Wow. And I'm assuming the publishers are now sprinting into the arms of rented, time-limited e-textbooks with DRM, and either eliminating or discouraging the sales of physical books that they can't fully kill resale of.
My wife asked me last week to help her get a textbook in a format that could be viewed on a reMarkable tablet, which can read PDFs but won't work with arbitrary DRM schemes. I checked my options and found the publisher selling some DRM crap, and some clearly illegal sites selling DRM-free PDFs. Since I found plenty of people vouching that they'd received what they bought, I chose to (using a Privacy card number) willingly buy from the criminals, since they were the only ones willing to provide me what I needed: an unencrypted PDF that we can actually use on the device we want.
I know publishers are afraid someone will email the PDF to the whole class, so that's why college textbooks probably ought to be folded into tuition, that way (1) publishers can get paid for the correct number of copies and (2) someone who actually has to pay the money (the school) is somewhat in the loop on textbook selection. It's broken now since those actually paying (students) have no say in book selection.