ehentai content blocking in Japan

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Has the owner ever said anything about how content is blocked in Japan? Recently almost 20% of new galleries are immediately hidden from Japanese users (they appear as deleted).

Here are some examples.

-[Aieda Nao × A.S.Hermes] Koujoku no Reijou Lorenza http://exhentai.org/g/717235/0ed2e4dad7/
-Buriki ブリキ] 退魔教師希彩 羞虐の学園 http://exhentai.org/g/566720/9a5861339a/
-[DMM.com] Angelic Saga http://exhentai.org/g/849794/d63003c3cd/
-[I-Rabi] http://exhentai.org/g/678681/d8352f3eaf/
-[Karino Kei × Midorigi Mura] Kanshin no kishi Aruberuto inbina majo to irekawatta nikutai 換身の騎士アルベルト http://exhentai.org/g/568140/2d903b815f/
-Little Cheese] Kuro to Kin no Akanai Kagi http://g.e-hentai.org/g/323128/2d05263927/
-ナナロク http://exhentai.org/g/737974/d2b868cca5/
-rindou] 女捜査官催眠調教 痴女に変えられた私 http://exhentai.org/g/715956/b15ad37a4f/
-Rindou, Kodou Kuji] ブラックウイドウ 黒衣の暗殺姫 http://exhentai.org/g/716241/293b69d23d/ Black Widow http://exhentai.org/g/560821/edac93dc9f/
-[Saki Mizusaka × Takahama Tarou] 魔術師とアルカナの化身 http://exhentai.org/g/568114/6daa18e355/
-[Softhouse Chara] Sono Kojou ni Yuusha Hou Ari http://exhentai.org/g/884101/6ff5e8e9d9/