And if this is invitation only, how can they know? I can understand if it's an application started from the person itself, but invitation? How can they know?
From what I can see on their website (
https://www.bitcoinblackcreditcard.com/) people can request the access to bitcoinblack card. The big difference compared to some other cards like Binance Visa is that not everyone will get accepted, meaning you will have to prove that you are wealthy enough + some other factors (they didn't disclose that).