The moat on that is non existant.
If I'm working in software development, the last thing I want to do is trust my coding workflow to an alpha-state platform.
Im personally down to try alpha software usually, i just havent found the need to retrain all my muscle memory to not use GH yet, as much as I hate it's owned by microsoft nowadays.
They also do offer pretty good "free tier" services for CI via Actions that otherwise you'd need to pay yourself
Also, I moved about 10 repos to a private Forgejo installation with pretty average (non-trivial) GH actions workflows. Zero repos has workflows running oob (java, .net, node). The moat is a bit there.
A feature, not a bug. If I go to a website meant to distribute source repos (git, etc), I expect them to be FOSS. Also, the title mentions 'EU Open Sources [...]' so this is irrelevant to the topic at hand.
Either way, perfect is the enemy of good, and this is good. You can find hypocrisy or lack of perfectionism anywhere.
I guess if the github UI becomes critical to their continued development or PR then they expose themselves to a potential rug pull by github/microsoft.
I do not know much about the project so I can not tell if that is concern or if there is some other concern at play here or if those concerns apply to this project or not.
Those are the types of details I wanted to see in the comment.