We are essentially competing in the same space with https://dime.run/ https://dime.run/ We also use VMs. But they are persistent. So you always see your runner

We are essentially competing in the same space with https://dime.run/ https://dime.run/ We also use VMs. But they are persistent. So you always see your runners as Online in GitHub UI. We achieve this by investing in virtualization technology so that idle runner VMs do not consume too many resources. Disclaimer: I used to work for Google Cloud.