Textbook companies along with Chegg (which is owned by a textbook company IIRC), and organizations like College Board and World News and Report form what you might call the Educational Industrial Complex. Just like Big Pharma or Big Tech, their goal is power through exploitation. You might check out OpenStax for a text (it’s free) and r/physics (as much as I’d prefer not sending people to reddit). Or DM me. I’d be glad to help. It’s literally my job.