[avery42]

I'm guessing they mean it's free for Github Actions that run in a Docker container: https://docs.github.com/en/actions/creating-actions/creating...

[judge2020]

Probably just GitHub Actions in general, although I'm not sure if it differentiates between self-hosted runners and hosted runners (which presumably run in the same Azure datacenter where transfer is free/less than $0.01/gb).