The problem is that legal terminology doesn't always match conventional descriptions of what's happening.
Copyright is actually a perfect example of this. In order to send my photo over the Internet to other people who want to view it, you need much more than the legal right to display my picture. Sending a picture over the Internet involves copying, distributing, and sublicensing the image countless numbers of times. So any site with user-uploaded content will have something very close to (Imgur's for reference):
> With regard to any file or content you upload to the public portions of our site, you grant Imgur a non-exclusive, royalty-free, perpetual, irrevocable worldwide license (with sublicense and assignment rights) to use, to display online and in any present or future media, to create derivative works of, to allow downloads of, and/or distribute any such file or content.
There's no way the typical user will understand this, but that's not because it's obfuscated. The typical user just doesn't have the background to understand what all these rights are or why Imgur requires them. It would be severely misleading to write the literal meaning in layperson's terms:
> When you upload pictures, you have to give us the right to make as many copies of the pictures as we want, modify them however we'd like, and send those copies to whoever we want anywhere in the world.