Well I learned over a decade ago that they have had Pass/no-credit for the first year implemented for years... So at this point it wouldn't surprise me if you said it's been going on for two decades (at min.)
Again, I think people are having the same reaction I had "what, MIT just gets off scotch free for the first year?!". Decade later, watching it help relieve the stress from their rat race of 110% from their childhoods... Man is it worth it. And everyone still loves hiring people out of MIT