Because they learned from the best when it comes to false advertising.
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And, obviously, because reality would be unbearable for them: they were promised to become sultry anime gurlz with big anime tiddies and a fully functional sexual organ that even real gynos can't tell from the real deal, not disgusting coomers without any ability to coom. Exciting and fulfilling sex life with real lesbians lining up at their door, not a painful procedure they must repeat multiple times every day until the end of their pathetic lives only to preserve a festering mutilated wound that would close up otherwise and the complete lack of nerve endings. They were sold and acted on a lie which is so radically different from their actual daily life they must keep lying to the world and themselves.