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Когда я увидел заголовок, я подумал, что Марк сошел с ума. Однако, он приводит хороший довод:

Does anyone really think its free ? That all the bandwidth consumed with content being distributed by P2P isn’t being paid for by someone ? That bandwidth is being paid for by consumers. Consumers who pay for personal, not commercial applications. When consumers provide their bandwidth to assist commercial applications, they are subsidizing those commercial applications which if it isn’t already, should be against an ISPs terms of service.

И, заметьте, он не говорит про пиратство.