event.preventDefault cannot block clipboard paste in chatgpt.com prompt box

I’m using following codes to block paste to certain webpages

document.addEventListener('paste', (event) => {
    event.preventDefault();
});

It works in most cases except for prompt box in https://chatgpt.com. here is what i did step by step:

1. open https://chatgpt.com with chrome for windows
2. open console and run above codes
3. copy some texts and paste to prompt box with CTL+v or rightclick->paste
4. texts are pasted successfully

I wonder how it pasts text and is there any way to block it.