The security concerns were not addressed by not accepting new links. As the post you replied to said, > The play was to scrape the web for old goo.gl links tha

The security concerns were not addressed by not accepting new links. As the post you replied to said, > The play was to scrape the web for old goo.gl links that went to expired domains, register the domain, and then you have a goo.gl URL that you can send wherever you want, indefinitely.