What does Zcash mean for Ethereum?

As evidenced by the rise of ransomware, illegal gambling, and other lucrative online “enterprises,” it would appear that the level of privacy provided by bitcoin is sufficient for the purveyors of these “services.” Zcash claims to enforce an even higher level of confidentiality, so that absolutely no one is gonna know nothin’ ‘bout nothin’ ‘bout somethin’ that never happened. And yet one must still ask: What exactly is the value added?