That's FUD. Apple actually did have a ZFS port for the Mac they were working on. And they successfully ported DTrace way back when as well (you can still use it

That's FUD. Apple actually did have a ZFS port for the Mac they were working on. And they successfully ported DTrace way back when as well (you can still use it today). I expect that the lawyers wouldn't have allowed anyone to work on a port of a project with an "IP shadow". The most likely reasons were probably either NIH, or worries about the greedy resource requirements of ZFS.