My argument isn't that Google doesn't shut down B2B services. It's that I have seen no evidence that Google does it at a vastly outlying rate relative to the industry.
IANAL, but Both AWS [0] and Azure [1] have 12-month deprecation policies - this is industry standard, as mentioned in the Google Developers blog you link.
[0] https://aws.amazon.com/agreement/
[1] https://azure.microsoft.com/en-us/support/legal/subscription...
(work at G)