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You mentioning the concept of pi containing every substring makes me think of Borges' Library of Babel.

Ha, next: a compression algorithm that requires the user to first build an infinite library...

Yep, the Library of Babel is a related topic. Wikipedia links it as "See also" on the page of "Normal numbers".

> a compression algorithm that requires the user to first build an infinite library...

Kind of already exists, pifs. More like a joke, but the concept is already a joke so...