We have no immediate plans to support these runners on Drone cloud for different reasons.
Macstadium is an awesome service and we would love to offer support, however, Drone Cloud is completely free for open source projects and does not generate any revenue. We would have to pay for the service out-of-pocket, which is quite expensive, and difficult for us to justify at this time.
We have no plans to support docker pipelines on Windows primarily because we find Docker for Windows to be half-baked and not friendly for service providers. There are many issues with Windows, but the most notable is that Docker images on Windows are kernel-specific. This means we need to provide pools of separate Windows servers for every major Kernel version (1709, 1803, 1809, 1903, 1909, etc).
With that being said, I do envision us providing windows support through an AWS runner which would allow you to spawn AWS instances using your AWS credentials.