Buying MacOS X is NOT Piracy. Running a purchased copy of MacOS X on non-Mac hardware is NOT Piracy but it DOES mean you are breaking Apple's EULA.
Piracy is stealing, but what applie saying that it will not support or condone use of MacOS on non-Mac hardware.
Please do not use word 'Piracy' when it does NOT apply here.
Anyway I doubt MacOS X would work on an AmigaOne or Pegasos anyway without some sort of hack...