Credit card companies are discriminating against Japanese Manga sites with new restrictions.

Japanese Manga Industry Hit by Credit Card Companies’ Anti-Porn Restrictions
The immensely popular Japanese manga industry is reporting increasing pressure from multinational credit card companies — many based in the U.S. and directly targeted by anti-porn crusades by religious conservatives — to censor their contents to maintain their current payment processing arrangements.
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The War on Porn Regular Updates about the Assault on The Adult Industry