[Xeoncross]

Yes, the use-case of proxying images is a different mater. I was talking about client uploads since so many companies seem determined to waste my bandwidth and time uploading without resizing first.

[drdaeman]

Client uploads with client-provided thumbnails could lead to some pranks.

You know, a thumbnail with a cute kitten but something completely different after you click on it ;)

[Xeoncross]

I think you misunderstood. The client is uploading a single data blob for each image, but the blob can be smaller if the client resizes it first.