Earlier quoted context omitted.
Goo.gl didn't have customers, it had users. Customers pay , either with money or their personal data, now or the future. Goo.gl did not make any money or have a plan to do so in the future.
The monetary value of the goodwill and mindshare generated by such a free service is hard to calculate, but definitely significant. I wouldn't be surprised if it was more than it costs to run.
"Here's a permanent (*) link".
[*] Definitions of permanent may vary wildly.