If you extend it wide enough, one should ban natural numbers because some of them in binary form are identical to child pornography video files.
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There’s the concept of “illegal numbers”, which means that there are technically numeric representations of images or copyrighted material that you can’t know/possess without breaking a law. But the law is subjective which is why we have judges and juries to apply judgement to whether having a large number written on a piece of paper is equivalent to possessions illegal material.