Comment by mindajar

I think the point is that if Apple had to remove DTrace for legal reasons, the impact to Apple's business and customers would be minimal. If a hypothetical AppleZFS shipped on a billion devices and then Apple lost a patent lawsuit, Apple would be totally screwed. A filesystem can't just be pulled out of the OS without shipping a new one and converting every device. Apple could potentially be in a position where they couldn't sell any new devices at all, and ZFS support in other OSes wouldn't help at all.