Originally Posted by
ukgooner
All these people panicking, cancelling cards and causing themselves inconvenience expense - Why?!
Because the compromised card is no longer reliable after the data breach. As soon as the criminals try using it (at a random future date), it will be blocked by the issuer.
Of course, any card can get blocked for any number of reasons, but the probability is much higher when we know for sure criminals both have card data
and have already trying using some of stolen card numbers in the past.