Science calls this the social loafing effect

Science calls this the social loafing effect. It occurs when in-dividual performance is not directly visible; it blends into the group effort. It occurs among rowers, but not in relay races, because here, individual contributions are evident. Social loafing is rational behavior: Why invest all of your energy when half will do especially when this little shortcut goes unnoticed? Quite simply, social loafing is a form of cheating of which we are all guilty even if it takes place unconsciously,

— from Takeoff Into Chaos · Art of Thinking Clearly by Rolf Dobelli

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