This is supported by MinIO, but not "as a service." Essentially you run MinIO everywhere (AWS, GCP, Azure, IBM, on-prem, OpenShift, Tanzu etc). In the public clouds you can either roll your own or use the marketplace offerings.

In effect, you are choosing MinIO object storage over the "stock" object storage (which is incompatible with the other clouds).

You can use MinIO's ILM policies to replicate, tier, etc.

You still pay for compute, network + drive but then pay MinIO vs. S3/Blob. There will be no egress fees.