[schoen]

When I saw this title, I thought it was going to be about privacy rather than about incentives and motivation! I was envisioning something about Orthodox Jews who secretly code on shabbat and had other people notice because of their contribution graph, or maybe people whose employers thought an employee's graph reflected too much or too little effort or effort at the wrong time or something. ("Why are you working on the weekends?" or "why are you not working on the weekends?", maybe.)

On the other hand, the privacy argument might be hard to sustain because an external site or tool can regenerate much of it from the user's individual git commits.