Sometimes the acorn doesn't all far from the tree...
I don't see them doing anyting illegal. They are simply allowing the software to run on other hardware. The "rebel" product seems to be a stand alone program that lets OS 10 run on any PC.
Since they are not modifying the Apple code, or even copying it, then what they are doing is fine.
But in the end the judges will decide. (I bet and hope they win though)