We offered unlimited storage, unlimited bandwidth, for ever, for free — to anybody who has something to share that belongs in a library.
—Brewster Kahle, Entertainment Gathering Conference 2007 (republished as a TED Talk). The above quote is at 14:19.
The crux of it is of course “something that belongs in a library”. If one has something that could conceivably be held in a library, then there should be a library in which it can be held; the Internet Archive is one possibility.