Yeah.. everyone who says that "Graal owns/has rights to anything uploaded to it" has been lied to and is just spreading a false rumor. You can take your content with you wherever you want to outside of Graal, even if it was made using Graal's engine. I feel like that whole rumor was started back when Graal's source code and content we're being stolen and used for other projects and the rumor was spread as a sort of "crowd control".. but it's completely false.