OpenAI is selling a service. In the terms of this service they explicitly reassign rights of the output to the user. So implicitly they believe they own the ri

OpenAI is selling a service. In the terms of this service they explicitly reassign rights of the output to the user. So implicitly they believe they own the rights and are legally able to reassign them to you, a user of their service. In my view they do not own those rights originally and thus are unable to resign them.