I played Pong not long after it came out. It was probably one of the last video games that didn't have spam and had there been a way, it would have been spammed also.
PS - I forgot, there was a version that tripled the number of tennis balls on the screen so even it got spammed eventually.
Every RTS going back to the original Warcraft has had spam. COH2 is the least spam-friendly RTS that I've played.