"You understand that whether or not such User Submissions are published, Curse does not guarantee any confidentiality with respect to any submissions."
If we decide to publish your name and email address, we can do so. And if the CEO of XY calls and offers us $10.000 if we disclose all SVN submits and forum postings from email addresses with the domain XY.com (as he'd like to fire a few people who code addons while at work), then we can pass along that information too.
"In connection with User Submissions, you affirm, represent, and/or warrant that: (i) you own or have the necessary licenses, rights, consents, and permissions to use and authorize Curse to use all patent, trademark, trade secret, copyright or other proprietary rights in and to any and all User Submissions to enable inclusion and use of the User Submissions in the manner contemplated by the Website and these Terms of Service"
If we change the "manner contemplated by the website", we can use your proprietary rights in any way. All we need to do is shift the focus of the website.
"In connection with User Submissions, you further agree that you will not: (i) submit material that is copyrighted, protected by trade secret or otherwise subject to third party proprietary rights, including privacy and publicity rights, unless you are the owner of such rights or have permission from their rightful owner to post the material and to grant Curse all of the license rights granted herein;"
We're reminding you again: we can do whatever we want with the addon, in case we decide to do so. We can sell it, we can alter the code, we can remove your name from the code, we can restrict its availability to paying users or IP addresses with the US as origin (you'll have to understand that, our ad's don't sell well if you live outside the US, and we'd waste the bandwidth), and we can also add a splash screen containing an ad ingame (in case we can come up with a deal with Blizzard/Vivendi, but as both Vivendi (owning Blizzard) and AGF (the VC company that funded Curse) are french, we might find a solution). Oh, and we can also alter the 'donate' button you added to your addon, so that we get the money and not you. After all, you should be happy with free hosting.
Yes, this is an extreme interpretation, and obviously Curse would be stupid to do the above. But the problem with your interpretation is: it won't 'stick'. It's as good as mine. That's what I'm trying to show.
All that counts is the legal text.
PS: I'm still wondering how we'll deal with addons that use a license which does not grant commercial usage. I can only assume that displaying an ad next to its overview on the website or inside the new addon downloader can be a problem.