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Hello.
Although S3 is classified as a global service, objects stored in S3 buckets are separated by region.
https://docs.aws.amazon.com/whitepapers/latest/aws-fault-isolation-boundaries/global-services.html
I think it is classified as SaaS because it provides services without configuring the network or OS.
Not sure what is the significanse of IaaS vs PaaS vs SaaS in this context but AWS uses S3 as an example of IaaS storage service next to EC2 (compute) and VPC (network). I'm sure with little bit more of googling I could find examples for PaaS and SaaS too ;-) https://aws.amazon.com/what-is/iaas/