Por vários motivos, um usuário deseja estar ciente de que está deixando o website atual. Além disso, eles podem não querer ser redirecionados para um site diferente por vários motivos. Este aviso informa-os e dá-lhes a capacidade de cancelar.
Redirection notifications are used to protect sensitive user information, for example in case there is a threat of phishing.
Imagine you are logged in to a website that has a forum where users can post messages. If a link in one of those messages would redirect you to an external website that is impersonating the original website, a user could be tricked into thinking they are still in the same environment. The external website might try to abuse this confusion to ask for credentials.
Redirect notifications are used to alert a user they are leaving the environment and prevent possible abuse.