I don't think this opinion is that unpopular - I don't even like anime but still see these images pop up in memes and comics sometimes, with the laughable defence 'yeah this highly sexualised picture of a (10-16) year old girl is actually a 900 year old in a child's body so it doesn't count' or something.
The term is lolicon I believe. The fact I know that makes me want to cringe.
I remember having to change things I got from... places... from epub to mobi using calibre for my old school kindle to recognise it years ago. I don't even have that device anymore.
Glad they're accepting what appears to be the standard format tbh.