Bitcoins can be printed on paper, copied, bound, copyrighted, and self-published. One could then tear out pages and transmit them. Shall we outlaw books?
Certain types of pornography is illegal. There are more types in Canada than in US. US has outlawed books with those, and there are certain types of books that you can buy in US from Japan, but is illegal to poses in Canada.
I like the claim that government can outlaw anything. Especially if it's to "save the children," and it's very easy to see how Bitcoin can be targeted with that.