Actually, it doesn't really have much to do with lolicon content.
The root cause is a certain unnameable "earthboat." Whenever anyone discusses or shares her cards, she mobilizes a large horde of her "Death Eaters" to mass-report and attack, with the main focus being reports of child pornography.
She is extremely skilled at this tactic, and to date, countless large and small adult forums have fallen victim to her campaigns. There was a period when, no matter how big the forum was, administrators would cave to her threats, delete the content, and issue bans prohibiting any discussion of her. She also employs a ton of people to constantly monitor searches about herself. F95 was actively fighting her right up until it was forcibly shut down by its own admins, but in the end, they still lost.