I guess I should say more accurately: Their mission is to both archive it and publish it. They seem to be explicitly against copyright, on principle. Which I greatly respect.
Yeah, it seems to only be a problem when you're a human being remixing the culture you grew up with.
Meta can admit to soullessly scraping books they don't own for their for-profit AI datasets [1], and it's not a problem because they're Meta. But if you're an artist? Nope. Sampling in hip hop songs, for example, is in a "complex legal gray area" (translation: "it's illegal but we don't want to admit that out loud") [2].