Writing by itself isn’t art, but poetry and literature are. And, by the same token, I don’t expect most works of literature to be exhibited in a museum — books are easily copied, so there’s little value to just having the book’s text in a museum.

Works like the Black Perl[0] are decidedly artistic in nature. Demos (in the demo scene sense) are an artistic endeavour. Competitions like the Obfuscated C Contest or the Underhanded C Contest are very much judged on aesthetics.

0. https://en.wikipedia.org/wiki/Black_Perl