I setup a self hosted runner and then use that in my CI workflows. Then I disabled it from sleeping so it can clamshell forever and now it sits here in my living room silently workin' https://imgur.com/a/EaBICdo
And, presumably for a combination of the Mac build (and hardware) being of niche interest and sitting outside the standard Linux workflows so it's annoying to administer. And serving a money-making audience (iOS app devs) who have a revenue stream and see the extra CI cost as worth it.
