Email Verification

is Webapp a third party app?  Who is Webapp?  Since January 27, 2020, the login page defaulted to Webapp and added an email verification every time I logined to my account.  Why requiring every time?  Everyone knows email is not secure, freely given, and I am worried that someone else intercepting the email link that Simplisafe sent for verification and taking control of my account!  Financial institutions can tell whether a device is new or not, and do not require verification every time if it's from the same device, and will advice when a different device is used.  Please advice what is Webapp, why have to login from it and not from the Simplisafe website, why email verification needs to be used every time when logging in.  Thanks.
Sally Armstrong