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It’s because the first few generations of DRM were extremely poorly implemented. My og kindle keyboard still works and will ignore the DRM (that would be locking me out of, for example, a library book after its due date) if you just change the file extension to one of the DRM free file types. It will also then let me distribute that ebook to others without restriction.
I had an intro to sociology prof spend an entire lecture on full blown anti vax conspiracy shit.
Also had a bio prof take 5 during an anatomy lecture to give a teary eyed plea for the young women in class to not ruin one of the ‘fundamental joys of motherhood’ by getting their nipples pierced.