There are plenty of APIs and cloud-type products listed in the site I referenced. I don't know what the story with their SLAs or lack thereof was, but it's not

There are plenty of APIs and cloud-type products listed in the site I referenced. I don't know what the story with their SLAs or lack thereof was, but it's not like Reader was a one-off thing. (IIRC, there have been some seeming SLA-violation-esque deprecations of Maps APIs...) Google clearly has a culture that is OK with killing off services when it's convenient. Like I said, I don't know if/how this applies or will apply to GCP, but they have enough of a track record that it's perfectly reasonable to be wary.