

Docker is not virtualisation, although it’s a common misconception.
A better way to think of it is a security wrapper around untrusted processes.
You can prove this for yourself by looking at all the processes running in a Docker host while one or more containers are running, you’ll see all the processes listed.
In other words, you don’t need a CPU capable of virtualisation to run Docker.
I’m a software developer with over 40 years experience. Much of it with FOSS.
Your argument in relation to GitHub does not take in the reality of the effort involved with migrating to a different platform, effort that is likely unpaid, has no logistical upside and stalls the development efforts of a project, not to mention breaking every single source code repository link across the wider internet, links that represent publicity and community engagement.
It’s one thing migrating after a service vanishes, it’s an entirely different thing to migrate due to the philosophical differences perceived by the ownership change to Microsoft. In my opinion, chanting FOSS is insufficient as an argument.
I have several projects and clients that use GitHub and while I detest copilot and the enshitification that the new ownership represents, I’m also aware that it’s likely that the sale provides financial security to the continued existence of GitHub.
I think it’s admirable that a project is asking its community if it should stay or move and I wish the developer(s) wrestling with this all the strength and patience in the world to work through it.
I know I’ve struggled with the same considerations and I’m still using GitHub … for now.