"... you can't excuse your bad behavior by playing weasel word games."
BAD BEHAVIOR, BAD BEHAVIOR! You're accusing the majority of bad behavior in defense of industries that lie, cheat, and steal as if it was their god given right? They do not OWN our common culture and it's well past time they realized it. I shutter to think of where (or even if we would have one) our cultural heritage would be today if these thieves (yes, I'm calling the media industries thieves) had been around when cave painting were invented.
"The difference there is that it is discrimination, by excluding one candidate and not the other. What Paypal is doing isn't censorship or discrimination, because they are declining an entire segment of business, not a single company or individual."
It is censorship and discrimination because they are deciding what is and isn't a "dirty" book. Are the two books mentioned in the article (Sophocles’ Oedipus and Ovid’s Metamorphoses) and other (that at one time were considered) questionable books considered cause them to denied companies selling them access? If the answer is no then it by definition censorship and discrimination.
Paypal as a private company can take this stance, but don't claim they aren't using their market position to dictate public policy.
Did you read the entire article? Paypal acts as a middle man for credit card companies, banks, ect., they are the ones putting pressure on Paypal to do this. If Paypal says no, there goes their business. When your alternative says no, there goes their business. You need to direct your ire to the ones at the top.