It's worth thank we think...
I'm an avid reader of science fiction... and one of the things I've noticed with Anthropic Claude [Opus] is the quite remarkable knowledge that it has of an incredibly wide range of science fiction authors.
Opus has deep, detailed knowledge of e.g. E.E. Smith's "Lensman" series, written in the 1940s; as well as work by Alan Dean Foster, Nivens and Pournelle, Mike Resnick, Peter Hamilton, on and on.
And when I say "detailed knowledge", that probably warrants a bit of context... The "Lensman" series served as the inspiration for "Babylon 5", the 1990s TV Series show-run and largely written by J. Michael Straczynski. Claude not only knew that, not only knew that the reference in the TV show to the planet "Arisia" is a call-back to the novels, but had a deep understanding of the protagonists and antagonists... right down to knowing that a race of ancient, super-intelligent and war-like creatures, the Eddorians, were described as coming to our space-time from "another dimension"...
The only way that Claude could have this level of knowledge would be if Anthropic had trained the models on the actual source content of the books themselves.
The only possible explanation that shows how these models have acquired this level of detailed knowledge is because the people who built the models trained them on the works of these authors.
Charlie Stross is 100% correct - his work is being plagiarised and used without attribution.