One thing to consider with AWS is that a lot of the services are designed with multiple levels of isolation and independence beyond the region/availability zones. So a service that fails even 100 % for one customer may not fail even once for another. In such cases it is possible they do not post a general availability drop for the entire service since it may affect only a small number of customers. It may be posted to the specific customer’s personal health dashboard. It took years of operating such systems for Amazon to understand deeply how large scale systems can fail and incorporate those into the designs and even then it is an ongoing effort to make them ever more reliable. Now I don’t know how Google’s services are designed and if they don’t have same or higher layers of isolation then it is possible a failure affects most customers in a region thereby requiring a global status update.
Disclaimer AWS engineer.