OpenAI's terms are now pretty clear (or at least, with the obvious strategic ambiguity) on IP which I assume would apply to both ChatGPT and DALL-E: "OpenAI hereby assigns to you all its right, title and interest in and to Output."
But this is new as of a TOS update in December, and the previous version does NOT say this - but I have a vague recollection that there were explicit copyright terms for DALL-E. Does anyone remember what/where this was?