Google URL Shortener links will no longer be available- Google Developers BlogIn 2018, we announced the deprecation and transition of Google URL Shortener because of the changes we’ve seen in how people find content on the internet, and the number of new popular URL shortening services that emerged in that time. This meant that we no longer accepted new URLs to shorten but that we would continue serving existing URLs. Over time, these existing URLs saw less and less traffic
https://jp.techcrunch.com/2010/12/07/20101207twitter-virus/
