1) I have three different major credit cards and none of them have this feature. Your comment is still true in the abstract though, so I hope the amex product t

1) I have three different major credit cards and none of them have this feature. Your comment is still true in the abstract though, so I hope the amex product team is reading. 2) For a knowledgeable consumer, there is huge incentive to use services like this to prevent the credit companies from being a single point of financial data aggregation. But—and here I guess I'm talking to amex again—if disposable or per-merchant card numbers are widely offered by card providers, I'd expect most people would just use those instead of a more robust provider like privacy.com.