Google has a global SDN (software-defined network) that gives them some unique and beneficial capabilities, like being able to onboard traffic in the closest CDN POP and letting it ride over the Google backbone to the region your systems are running in.
The problem is that running a global SDN like this means if you do something wrong, you can have outages that impact multiple regions simultaneously.
This is why AWS has strict regional isolation and will never create cross-region dependencies (outside of some truly global services like IAM and Route 53 that have sufficient redundancy that they should (hopefully) never go down).
Disclaimer: I work for AWS, but my opinions are my own.
The problem is that running a global SDN like this means if you do something wrong, you can have outages that impact multiple regions simultaneously.
This is why AWS has strict regional isolation and will never create cross-region dependencies (outside of some truly global services like IAM and Route 53 that have sufficient redundancy that they should (hopefully) never go down).
Disclaimer: I work for AWS, but my opinions are my own.