Certainly, but I don't think Github has support for private changes and public logs, at least. And I can't think of any other standard service that does. Though I'm sure Airbnb could come up with some suitable service if it wanted to.
Also, I imagine a public log without being able to see the code would just be an exercise in frustration. And in practice, commit logs are usually quite technical, and hard to understand without context.
I expect if Airbnb was to make their code public they'd be getting a lot of bug fix suggestions, but I don't see that happening any time soon.
But I'm really most interested in having user changes recorded in the system, as I've said already in various places.