Update:

>> Why don't we make our own PowerPC CPU? [...] Really, could
>> it be possible [...]?

> Last time I looked you had to acquire an architectural license
> from IBM to do that in a legal way.

Or maybe that isn't needed anymore?

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=6775&forum=11&start=105

Seriously, a GPL'd Power Architecture implementation sounds nice. Is it legal? I don't know.