Are the resulting images copyrighted in the name of whiever generated them? What proves that this generation happened first - Shutterstock upload? What is to p

Are the resulting images copyrighted in the name of whiever generated them? What proves that this generation happened first - Shutterstock upload? What is to prevent someone from generating that same image with a prompt? What would prevent them from simplu resharing that image freely with everyone, or undercutting shutterstock? If Shutterstock tries to sue, the courts may say AI generated images do not enjoy copyright protection !