I can assure you WarpBuild has Mac runners that work very well. When I first switched GH only offered 1 Mac runner and it was horribly slow. Literally cut my build times in half by changing 1 line in my workflow file to use the WB runner.

Nowadays GH has more sizes by WB continues to beat them in price and performance.

It’s highway robbery what GH charges for the crap they provide. I can highly recommend WarpBuild for Mac (and Linux) runners.

I was talking specifically of macOS Intel runners. The sibling comment from the founder confirmed they don't have them.