Maybe they... buy them I mean, barring exceptional circumstances like insiders on pressing plants or theft, disc images must come from one or more original media, and that original media must be purchased by someone at some point. Which reminds me, the following hentai were licensed and released as uncensored Blu-Rays this year, but no one's uploaded them yet
Lady Does Butler / Cele Kano
Mother in Love / Tsuma no Haha Sayuri
Maid Ane
First Love
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