There is a reason why Twitter ditched Rails in favor of Node.js
LOL if you're going to spout FUD at least spout correct FUD - it was Scala.
There's extra bonus irony that both the service you're advocating switching from (Github) and the competitor people are switching to are written in Ruby.
That's true, but to be fair, the complaint is in the context of someone running their own instance of a private Gitlab service. Gitlab licenses their software, and Github doesn't. So you don't have to worry directly about how much the server is costing you.
That said, I don't see Gitlab's use of Azure as a huge issue. That doesn't give MS anywhere near the kind of control over the platform that they'll have with Github.
There's extra bonus irony that both the service you're advocating switching from (Github) and the competitor people are switching to are written in Ruby.