My concern about a certain service for masking your real card's details

After learning that you can't mask your real card's details with Capital One Eno if you don't have a Capital One credit card, I reclutantly opted for another well-known P rivacy-oriented Company, which should support my already existing credit card. However, why does this service need you to be a US resident in order to complete the registration?

Likewise, why does it need so many informations about you, such as full name, date of birth, residence and last digits of …

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