Everyone here is complaining about how they don't want to have to check their email every time they sign in. Why not just make an app that sits in front of you

Everyone here is complaining about how they don't want to have to check their email every time they sign in. Why not just make an app that sits in front of your email, scans for emails of the form 'sign in email,' and when it finds them provides a single button for you to press to sign in?