If anyone still thinks that Kobo pulled books because of their erotic content, consider that Kobo is promoting books like this:
[caution before you read the blurb. It may be disturbing]
At the same time, Kobo pulled picture books for 4-year-olds, poetry collections, textbooks, sweet regency romances....
In the UK, Kobo pulled books by just one criterion: If written by an indie author, it was pulled. (In the US, a mix of bizarre criteria was applied)
The really gross aspect is that people searching for deleted indie-authored children's picture books get shown books like that one.