It's definitely what we call 'purity culture'. Our government tries to make everything 'clean' and 'Christian' and younger audiences think anything sexual is bad--even art and fanfiction. Older fans don't care and will share/RT but younger folks won't.

A few years ago, in the West, people didn't really care about 'ages', we all knew it was a drawing. Then a series got popular and fans of a certain coupling decided to call it pedophilia, and ever since then, that's what caused the whole 'canon age'=no NSFW movement on social media :/