I don't think this is true, but I don't know this for sure.
From what I have read it seems that 'only' Bloomberg, Meta and Microsoft that uses c++ with exceptions.
And since both microsoft and meta are adopting rust in their services it seems to me that they are looking for another language than C++. (why else adopt a new language?)
LLVM has been for quite some time driven by Apple and Google.
WebKit, another Apple child.
Qt, it has to support environments where exceptions are not allowed, otherwise they would be losing customers, specially since Qt is older than C++98.
gcc, was initially written in C, and for quite long time had a mixed code base with minimal C++.
The companies adopting Rust aren't doing so because of lack of exceptions, they would still adopt Rust if the language had exceptions support (which panic and std::ops::Try kind of are), rather due to the type safety that C and C++ aren't able to provide.
You would be surprised how many games actually do support exceptions.
And since both microsoft and meta are adopting rust in their services it seems to me that they are looking for another language than C++. (why else adopt a new language?)
Following seems not to use exceptions(?)
LLVM: https://llvm.org/docs/CodingStandards.html#do-not-use-rtti-o...
AWS: (seems to be using Google's guidelines to be fair)
Webkit: https://gist.github.com/derofim/df604f2bf65a506223464e3ffd96...
Qt: https://doc.qt.io/qt-6/exceptionsafety.html
gcc: https://gcc.gnu.org/codingconventions.html#Exceptions
Unreal: (not totally sure, but I think it uses error codes internally)
Most of the embedded world. + any console game you ever played or heard of.