The Schuey chop has been brought out over several seasons. Rosberg nearly shortened LH's career from memory by moving him onto the grass at high speed, LH + Kobayashi last year at Spa (if memory serves) making contact in a similar fashion to Grosjean but obviously not at the start of the race so only affecting each other.
It seems that Grosjean is having a week off for being noobish and not understanding if he was clear of LH but if the same move was made by an established F1 driver like Schuey, would they have applied the same penalty? They may have decided to clamp down on the next major incident and Grosjean was the first in line.