There are already good answers, but for detailed information you can also see what US Copyright Office initially thinks about AI generated photos. I suppose the legal thinking is still evolving, but for now it might be best to have some additional human input to make sure it can be copyrighted in the U.S.
So, in addition to terms of service, copyright offices around the world may treat “AI photos” differently until there is a unified framework.
Easy way to make it “non-AI photo” is probably to modify it.