The EULA applies to leasing the whole OS. I don't need a whole virtual Mac to run CI jobs. It doesn't sound like there's anything stopping anyone from offering a Mac CI job runner that gets shared with multiple organizations at the same time.
Except as otherwise permitted by the terms of this License or otherwise licensed by Apple: (i) only one user may use the Apple Software at a time, and (ii) you may not make the Apple Software available over a network where it could be run or used by multiple computers at the same time. You may not rent, lease, lend, sell, redistribute or sublicense the Apple Software.
Make of it what you will.