FWIW, this also happens on desktop Macs.
27" 2019 iMac, 64GB, upgraded i9 CPU, upgraded Pro Vega 48 8GB, 1TB SSD, CPU goes to 100% (sometimes 101%) on Queen's Wish the moment it launches, and there it stays.
I realize Spidweb says in the post above that it's past their control, but I thought I'd nonetheless add another data point in case others search for desktop Mac 100% CPU usage issues on here as I did.
To further add, it was also doing this on my 2015 13" RMBP (i7 16GB), but I don't plan on running it there what with the new iMac.
All of that said, looking forward to the game! I named my character Aldous 😝