not true, since in the license it says its allowed, plus like frank said, it also makes all your content useless because It gives them freedom take it all.

as far as using other peoples levels, it says in the progress bar that your level design is 75% done, lets hope the 75% is all your own maps, and that these are just test levels, if not then that is incredibly rude. especially that every map is marked as created by daniel74, thats straight up wrong and potential for legal trouble, because even if they were free, i have never saw free software were the license say, go ahead, take credit for making it as well.