You won’t be able to create new short links after the 13th, but existing users can manage them via the console for the next year. After that, all the links will still work, but you won’t be able to access the console itself after March 30th, 2019.

Source: Google is shutting down its URL shortening service

It’s getting harder and harder to trust any new services from Google if it’s not one of their core services like Gmail or Calendar.