[colek42]

It looks like it, but think of the power. If you write your app for S3 and Amazon raises their prices 100x you can be running on GCP in no time. Of course, you just create interfaces for your data model and implement them with your favorite service, but nobody has time for that.

[sciurus]

In this specific case you'd already be able to do that, since GCP's Cloud Storage service supports S3's API.

https://cloud.google.com/storage/docs/interoperability