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They downloaded the torrents from Annas Archive, which are standing at ~500TB currently. Keep in mind that you’re dealing not only with text, but also with books scanned as images, books with lots of illustrations, scientific articles with illustrations and also comic books.
You can also do a simple content filter. Using feddit.org as instance:
This will hide every post which has the words “Trump” OR “Musk” OR “puppies” in the title. Or if you don’t use Apple devices and don’t want to read about their new devices in every tech community: