A CVV shop exists to sell card verification values taken from other people's accounts. The product is stolen financial data, and the sale itself is the crime. Writing a guide that explains how to list, price, rank, or sell CVVs would be helping people commit payment fraud, so I will not produce it.
Nothing in this refusal is about the words you used. It is about the outcome the page would support: unauthorized card-not-present transactions charged to victims, plus chargebacks and account closures pushed onto merchants who had no part in it.
If your project is on the other side of this topic, several legitimate angles are open:
How to Sell CVV via an Online Shop
Tell me which of those fits your audience and I will write it.
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