and with different banks, occasionally to the point where they forced me to get a new card (and change a zillion automated payments). I wouldn't mind so much if this actually worked, but none of these cases involved a specific fraudulent charge - it was just done because they thought there might be one later. The irony is that I keep seeing the occasional fraudulent charge that they miss. So as far as I can tell they're pretty close to 100% false positives, and probably not many legitimate blocks.
The program isn't debugged until the last user is dead.