What is the credit limit on a black card?

Could you please elaborate on the credit limit associated with a black card? I've heard these cards are often associated with high-end luxury and exclusivity, so I'm curious about the financial boundaries they provide. Specifically, is there a standard credit limit across all black cards, or does it vary depending on the issuing bank or the individual's creditworthiness? Additionally, how does one typically qualify for such a card, and what are the typical benefits and perks that accompany such a high-end financial product? I'd appreciate your insights on this matter.