For courses on Queendom Platform, you retain ownership rights of your content? You can post the introduction video elsewhere, (e.g Queendom, my blog, social media, etc.) to help promote and link back to the class? Queendom promises the students lifetime access to your course, you can close the course, but the existing students will have access to it. On the Queendom Platform, you retain all of your ownership rights to your content, but content on Queendom's Platform site grants a limited license to Queendom and other affiliate users. That license is a "worldwide, non-exclusive, royalty-free, transferable license (with right to sub-license) to use, reproduce, distribute, prepare derivative works of, display, and perform that Content in connection with the provision of the Service and otherwise in connection with the provision of the Service and Queendom's business, including without limitation for promoting and redistributing part or all of the Service (and derivative works thereof) in any media formats and through any media channels".
If you leave, Queendom retains the right to keep copies of your content on its servers.