Once conveniently posting photos at imgur.com was introduced I see many users uploading photos right from their camera. For example, here the second photo is 2,5K by 2K pixels and has size of 680K.
I can't see why this photo could not have been downscaled to much smaller size without any loss of useful information. Firefox downscales it to 630×471 before displaying it to me and it still looks great.
Downloading heavyweight images consumes a lot of traffic and that's an issue in many cases.
Could you please invent something that would encourage downscaling images?