Earlier quoted context omitted.
i read in an earlier thread for this on HN - "this is a classic example of data driven product decision" aka we can reduce costs by $x if we just stopped goo.gl links. Instead of actually wondering how this would impact the customers. Also helps that they are in a culture which does not mind killing services on a whim.
The Google URL shortener stopped accepting new links around 2018. It has been deprecated for a long time. I doubt it was a cost-driven decision on the basis of running the servers. My guess would be that it was a security and maintenance burden that nobody wanted. They also might have wanted to use the domain for something else.
Yeah I can't imagine it being a huge cost saver? But guessing that the people who developed it long moved on, and it stopped being a cool project. And depending on the culture inside Google it just doesn't pay career-wise to maintain someone else's project.