[2021] I can't run CK3

Looks like it's having trouble with the video setup.

In Steam please click on Steam-Help-System Info, and paste everything there into a text file and attach that here.

Does Stellaris run okay on it, as a matter of interest?  

I guess this is the problem:

Video Card:
Driver: Unknown Unknown

At this point I think you should seek a refund for this purchase, as I don't know at present what the support status of our games under M1/Rosetta is.

Sorry about that!  

I can see it used to work a couple of months ago:
https://www.reddit.com/r/macgaming/comments/jvzd9v
So I can only guess a Big Sur or firmware update has done something here ...