how does the physical JCB card prevent people? Amex has an agreement with JCB (for over 20 years) for JCB to process all Amex cards. Amex is accepted everywhere

how does the physical JCB card prevent people? Amex has an agreement with JCB (for over 20 years) for JCB to process all Amex cards. Amex is accepted everywhere because JCB is accepted everywhere