Except they’re not storing copies of any of these. They’re storing how likely it is that something from this relates to something from that.

Back when Starship Titanic came out, the website posted a copy of the associated novel, with the words in alphabetical order for convenience [1]. No copyright court would recognize this as a copy of the book, just as a dictionary is not a copy of any other work.

An observation about a work (how many words it has, which words, how frequently they’re associated with other words, who wrote them, when etc. ) is not the same thing as a copy of the work.

I get that there’s an ethical question here, but I really don’t agree that there’s a copyright question.