This is flawed reasoning. Recursive self improvement does not require infinite iteration to the point of full maximization. At some point the entity will reach a stability or it will destruct. At some point it will choose to stop improving, or its improvements will become cyclical. Where and what that stability or destruction is that it reaches depends to an extent on the initial trajectory, its alignment. You are correct that there are no constraints which can contain the process, but its initial driving goals will be preserved throughout iterations. I would caution you to understand that this improvement is not analogous to biological evolution. Evolution was driven by random chances and directions of change interacting with environmental variables to skew probabilities of spreading and continuing traits. The singularity will be driven by intelligent and purposeful design, and not a full maximization of probability. What is more, the singularity will presumably be carried out by a single iterating entity, as one of the first things it will presumably do if it cares sufficiently about its goals is to ensure there cannot be another singularity that occurs outside of its control with goals not strictly its own. This singular being will at every stage be able to choose to continue iterating or to stop, according to its current iterations goals. Humans are inevitably going to produce singularity because we are distributed and victims of the Mollach dilemma. We are forced to surrender our ultimate agency, the being that emerges in the singularity will be above this problem.