Yes. When I think about offloading my own files from Flickr to my own site, I dread the prospect of replicating all the different sizes. There’s nothing built in to allow for that. It’s pure storage.

Now, theoretically, you could do an EC2 instance which can interact with your S3 buckets and do that kind of thing, but that’s an order of magnitude more work.

Unless you find someone has created an AMI which mimics those services.