Why is number generation called virtually invisible to cardholders?

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Number generation is virtually invisible because cardholders cannot tell that their card details were generated and reused

Number generation is called virtually invisible to cardholders because there is no way for them to know that anyone has generated a copy of their credit card numbers. Scammers use algorithms to generate millions of random combinations until they find card numbers and CVC combinations that work, and the process does not create a clear signal to the cardholder. As a result, cardholders have no indication that their numbers have been generated or that someone may later use them for transactions.
It leaves no direct notice for the cardholder
The key point is that cardholders have no method to see or confirm that someone has generated a usable copy of their credit card numbers. The activity is described as having “no idea” element for the victim, meaning the cardholder cannot observe the generation step. That lack of visibility is what makes the technique virtually invisible.
Scammers can generate working numbers and CVC combinations without the victim’s awareness
Scammers generate random number combinations and CVC combinations until they find ones that allow transactions. Because the approach relies on algorithmic guessing at scale—millions of combinations—there is no moment where the cardholder is alerted that their details are being targeted. Working combinations can then be used without the cardholder knowing how the access was obtained.
It can be used on cards the victim does not even pay attention to
The description also notes that scammers may generate numbers that allow access to cards that a person never uses and does not give much thought to. Even in that situation, the cardholder still would not have a way to know that the relevant numbers were generated. This further reinforces why the process is considered invisible to the person whose cards are being targeted.

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Why is number generation called virtually invisible to cardholders?

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