https://gsuiteupdates.googleblog.com/2020/01/app-maker-update.html
Google App Maker, the low-code development environment will be shut down on January 19, 2021
Due to low usage, Google App Maker will be turned down gradually over the course of 2020 and officially shut down on January 19, 2021.
From April 15th, you can no longer create new App Maker apps. From January 19, 2021, all existing App Maker apps will stop working.
