Moreso an apple with controversial but not strictly CSAM material based in a country where it's content is legal. Actually, not even an apple; Lemmy and the fediverse aren't an entity. It's an open standard for anyone to use; you don't see the Modern Language Association being blamed for plagiarized essays written in MLA format, or the WHATWG being blamed because illegal sites are written in HTML, so it's not a fair comparison to say that Lemmy/the fediverse are responsible for what people do with their open standard either

It's Pawoo, Pixiv's (formerly) own instance, which is infamous for this kind of content, and those are still "just drawings" (unless some artists are using illegal real-life references).