I always appreciated the professors that looked out for us and warned us of the places not to get any textbooks from, with links so we could recognize what to avoid, of course.
Then we'd get a professor that gave up doing anything and had us buy a $200, license (with a $200 textbook) to an online course that taught and graded his class.
Fun fact: you can email authors of papers and ask for a PDF. Authors don't get paid when you buy a paper (in fact it usually costs money to publish) and they'll generally be happy to send out their work to anyone interested.
If you haven’t bailed from the platform completely you certainly shouldn’t join the facebook group “ask for pds from people with institutional access” either