> possibly because they are bound (?) to PPC by their license
Since the 2009 settlement agreement, which took over from the 2001 contract, with Amiga Inc. they're allowed to port OS4 to whatever they want, including other ISAs than Power Architecture.
"an ARM/X-Scale version of AmigaOS 4.x is perfectly possible." http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=33800&forum=25&start=40#618192
> not that they have honored that contract to a greater extent before
In terms of the settlement agreement there is no "before" the settlement agreement.