Why Aren't Other System Programming Languages (C/C++) Popular for Backend?

Hello, when I look at other programming languages, something came to my mind. For example, C/C++ have web libraries, but they are not very widespread or widely adopted. However, the opposite is true for Rust — Rust has modern web libraries, and they are being used. Is there a reason for this? For instance, if I said I wanted to build a backend with C/C++, most people would advise against it. But if I said I wanted to do it with Rust, I would likely receive responses like "Rust is suitable for the backend."

"Some people have commented, thinking that I have a negative attitude toward C/C++ languages due to the question I asked. However, I definitely don't have such a view. I simply asked the question with good intentions, genuinely wanting to learn."