Google recently announced a 'quiz' - more of a tutorial - on identifying phishing email: https://phishingquiz.withgoogle.com
It includes a sample URL: https://google.com/amp/tiny url.com/y7u8ewlr
Note: I have added a space between tiny and url to allow me to post this.
When followed this is converted into: https://www.google.com/url?q=http://tiny url.com/y7u8ewlr and a Redirect Notice page is shown with this content:
The page you were on is trying to send you to http://tiny url.com/y7u8ewlr. If you do not want to visit that page, you can return to the previous page.
Following tinyurl link takes you to a Jigsaw page - Jigsaw and google seem to have cooperated in producing this quiz.
Putting in any schemeless domain name and optional resources (eg. ibm.com) work as well. https://www.google.com/amp/ibm.com
Why might google.com perform these redirections? Are they a security risk (as they can make any URL appear to be from google)?