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> Did vibe coding the business page inject it into ChatGPT's training data?

No, at least not directly. Inference does not train models. It is possible that OpenAI may separately collect the chat data, clean it, and feed it back into the model for future iterations. Or they could have extracted URLs for future indexing.

More likely though, I suspect, is your site just managed to be indexed naturally, and LLMs are very efficient at matching obscure data to relevant queries.

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Interesting. Maybe someone could run bot farms that ask variants of the same question and subtly nudge the model by replying reasons why the model's recommended service A is inferior to service B. Or other forms of adversarial question answers sessions.
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It's quite possible that SEO-wise the site does not make the cut into top x Google results but still is findable and considered by ChatGPT when it does its searches.

Especially in a longer ChatGPT conversation or via deep-research or more agentic modes (e.g. "Pro").

ChatGPT spends quite some time and diligence on searching.

Great for content that is not hyper search engine optimized but still (or even more) relevant. It bubbles up.

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I think the chatgpt backend basically includes indexed web like Google, or any other search engine.

Could Google be actively trying skip generated-looking sites/content?

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