Throwing move is super weird too. I believe that it was a mistake to not treat user move like C++11 destructors and default to noexcept(true) on them. But it is what it is.

On the other hand, writing special member functions at all(move & copy constructor/assignment, destructor) is a smell for types that don't just manage the lifetime of an object(unique_ptr like things). People should not generally be writing them and being open to the mistake of getting noexcept wrong.