Isn blocking spam censorship?
No. Censorship is blocking information based on its content. Spam-blocking merely keeps the content in its proper place. My local public library has a bulletin board where people can post for-sale ads and business cards; they would be rightfully upset at someone who inserted an advertising flyer inside every book on the shelves, which is the equivalent of posting a notice to every Usenet group. It would be censorship to try to restrict advertising from all parts of the Internet. However, asking someone to pay the fair costs of their actions is not censorship, it’s simple economics.
