This. Spent almost 3 years at Google and my view is that it is an intended side benefit of how they do development.

If something that relies on say, one of their log services, and that log service is getting end-of-lifed then all the dependent services that aren't really critical will also get shutdown. It's a forcing mechanism to keep the amount of cruft down. If that service that relies on the old service is that important they'll put the resources on the project long enough to port it to the new service.