The risk might be small -- but is it a risk they need to take at all? We're talking about a very mature project here that more or less needs to move at the speed of standards bodies, which is basically glacial. Being the first to implement C++ 29 probably isn't that big of a deal. People do not upgrade their compilers daily, shit, most projects stay on the same version for years, so optimizing for velocity seems like a bad idea here.

Yeah, I would question that part. On other hand I would not as them risk being able to sue worth it. Which use of LLMs could very well result in.

I think you know that well-known, highly visible entities usually set their legal bar a bit higher than "I'm sure we won't be sued over this".