

If no password is needed to do authentication, then any script and any user is able to do whatever they want on your system. Basically every script and application has root access by default. That is something you do not want to have. Even more important in multiuser environments.




I would just use an old phone, either yours or maybe from your family. A dedicated alarm clock that stays at home and is always charged. It has only one job: alarming. No need to make yourself dependent on a random online website. This can be done offline.