had these drum banging, whistle blowing, buzzer things going? And no one reported it until one of their own called them out three years later?

Changing your signs requires you to know the other team is stealing them. No reason to cross up the pitcher by continually changing the signs.

The "change your signs" reply is justifying the whole team cheating. Like I wrote earlier in this thread, it gave one team a critical advantage. There is no excuse for any type of cheating. Work harder than the other team, be better baseball players, be smarter, practice more, study the pitchers... Don't bang the drums using a camera to determine what the other team is going to do. In baseball terms, that's bushleague.