I've been watching one author's work. He's very dark and taboo, and he wrote one called Better the Devil you Know ('ll not tag it as it's an open forum). He's perfectly open with the content if you read the blurb. When he first started, he felt forced to tag as it erotica because he knew the high sexual content was the main driving factor. He was in contact with Amazon over how it wasn't consent; it was rape, and that he felt very uncomfortable with it having to be marked as erotica. The book was banned originally, then when he spoke to Amazon again, and he went through the explanation again, they told him to remove the erotica tag, and put it under horror. It's not been reported since.
I think it is very much the tagging rape into the erotica category that makes it uncomfortable with Amazon, but also how the rape is handled. Bey uses rape in Better the Devil You Know as a main part of the story: it's repeated as a main plot. I have rape in one of mine that's very graphic but didn't get banned. Difference being, I think, my rape was only a small part of the story, where the main drive of the plot was the recovery and rehabilitation combined with the main romance plot, so mine's tagged as gay Erotic Romance. Bey's is very much horror.
I think it is very much the tagging rape into the erotica category that makes it uncomfortable with Amazon, but also how the rape is handled. Bey uses rape in Better the Devil You Know as a main part of the story: it's repeated as a main plot. I have rape in one of mine that's very graphic but didn't get banned. Difference being, I think, my rape was only a small part of the story, where the main drive of the plot was the recovery and rehabilitation combined with the main romance plot, so mine's tagged as gay Erotic Romance. Bey's is very much horror.