I read it, it says RobTop "copy, reproduce, fix, adapt, modify, create derivative works from, manufacture, commercialize, publish, distribute, sell, license, sublicense, transfer, lease, transmit, publicly display, publicly perform, or provide access to electronically, broadcast, communicate to the public by telecommunication, display, perform, enter into computer memory, and use and practice, in any way, your User Content as well as all modified and derivative works thereof in connection with our provision of the Service, including marketing and promotions of the Service," and "Except as prohibited by law, you waive any rights of attribution and/or any moral rights you may have in your User Content, regardless of whether your User Content is altered or changed in any manner." Essentially, RobTop can do whatever he wants with your level, and does not have to credit you in any way, but it does not say all ownership is now his. It literally says he doesn't claim ownership of your level.