What was the USP of their CI service?
To create an ephemeral (docker-like) MacOS VM on a Mac with full performance and access (e.g. GPU) you have to use a virtualization API provided by Apple.
For most CI use, you can choose between:
Anka, a "contact-us for pricing" closed-source projet, where you have to pay expensive license (easy 3000 USD/yr per machine)
or tart, which is a lightweight wrapper around the official Apple API.
But you have to know that on MacOS, there is an artificial limit of 2 VMs per Mac... but well:https://github.com/cirruslabs/orchard/commit/3cfa2445500f45f...
With https://khronokernel.com/macos/2023/08/08/AS-VM.html
Some people might find it very attractive:
Instead 25 Mac Mini you might need only 5.
+ No licensing to pay to Anka.
Even without bypassing the limit it is great actuallyBetter UX than their competitors and support for many different images.
Ability to virtualize on Apple devices and linux with GPUs https://github.com/scipy/scipy/issues/24990