Comment by cm2187

I cannot agree more, I do the same, and invite everyone else to do so.

- Useful as a canary of which website has been breached

- Useful as a canary of which website sold your details

- and if your details are in the wild, you can stop the spam by deleting the address

Credit cards should work the same way: a unique authorization code specific to this vendor or this transaction and useless to any other actor.