Oh I see, didn’t know that. However, the SmartZoi and other AI generated gameplay is powered by… NVIDIA ACE 
Just discovered that myself today:
So it’s not like the devs didn’t want too, but I presume there were no other crossplatform options available… In any case, it should be listed on the store pages to reflect that which currently isn’t the case.
If you haven’t heard of NVIDIA GeForce NOW, it let’s you stream inZOI to your pc. Unfortunately you need to get a premium subscription (day passes are available too) in order to access the full inZOI experience 
Link: NVIDIA GeForce NOW
I’m curious what the macOS and console versions will include when the SmartZoi feature is NVIDIA locked.
-Dave