No, this is just using GH Actions runners as ephemeral dev machines for your software work, plumbed together with cloudflared and tor for SSH and HTTP connectivity. It would likely been just a % of all Actions across all other jobs even if it was wildly popular. This is a mistaken interpretation, in reality.
You can read what it is more clearly, here: https://github.com/crisdosaygo/ghostbox-home-reveal