What you can't sell via Paypal
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Prohibited Activities
You may not use PayPal's services for activities that:5 - involve the sending, posting or publication of any messages, content or materials that, in PayPal’s sole discretion, (a) are harmful, obscene, harassing or objectionable, (b) depict or appear to depict nudity, sexual or other intimate activities, (c) depict or promote illegal drug use, (d) depict or promote violence, criminal activity, cruelty or self-harm (e) depict, promote or incite hatred or discrimination of protected groups or of individuals or groups based on protected characteristics (e.g. race, religion, gender or gender identity, sexual orientation etc.) (f) presents a risk to consumer safety or (financial) wellbeing, (g) are fraudulent, promote misinformation or are unlawful, (h) infringes the intellectual property rights or other proprietary rights of any party or (i) are otherwise unfit for publication.
So Mark Twain, medical texts, historical fiction, Shakespeare (My GOD, "The Merchant of Venice!"), Band of Brothers are all verboten.
Did I read that right?