Trusting Google’s Gemini with anything seems to me like a bad idea.
But here are unofficial answers your questions from a fellow developer:
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Your public game likely was delisted for the same reason thousands of games were delisted since in the past year: it has adult NSFW content.
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From observation, I’m guessing your game as it is won’t be reindexed. You have images in a realistic style of characters who look like teenagers being “corrupted” by an adult character in a sex game. You might be lucky to retain any visibility as the current practices go.
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Why did this happen now? If you’re accepting payments for a similar game, or it looks by keywords that you could be, then that might have flagged your account for another internal review.
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I’m not sure what counts as a duplicate game to the itch.io team, but I feel that’s not the issue here.
My recent experience with having a copy of a game in a restricted page while another was public didn’t delist anything. Altho, that was for testing and development, with the no payment option. Specifics might matter?