Fabrizio's betrayal was so cutthroat that he was originally going to get his comeuppance and be executed by Mike, in person.
But I've heard different reasons as to why they took this scene out whether it was due to the effects looking bad, to Al Pacino accidentally injuring himself to Coppola &
company realizing that it would be too risky for someone of Michael's stature to personally get his hands dirty, so they went with the car bomb at the pizzeria instead, which also sadly got deleted. I was always pissed that Fabrizio actually got away with his betrayal.