Earlier quoted context omitted.
But possession of child pornography is what's illegal. They very well may have reported the owner of the blog to the authorities but, in the mean time, google was both possessing and distributing the material. It's not that it's violating their TOS, it's that Google thought they may have been violating the law. EDIT: At least if that's what the content was.
From the OP who said: > "I've read a few of Cooper's books and the short answer is yes, pedophilia is a common theme in his writing (as is incest and necrophilia)." Because of the words 'book' and 'writing', I have the impression that everything there is written text and no certainly no pictures. This puts it in a nebulous position, at least in the USA. Dunlop v. U.S., 165 U.S. 486 (1897), ended up ruling that text-o…
> Cooper used the blog to post his fiction, research, and visual art, and as Artforum explains, it was also “a platform through which he engaged almost daily with a community of followers and fellow artists.” His latest GIF novel (as the term suggests, a novel constructed with animated GIFs) was also mostly saved to the blog.