This. us-east-1 is the oldest region IIRC and it has its share of issues. Back when I used to work mostly on AWS zonal outages used to happen once in a while, but entire regions were rare, forget global outages.
The global outage thing seems to be a consistent "feature" of GCP - how are we supposed to architect our deployments if the regional isolation model is not a bulwark against high availability on GCP?