These satellites don't have the on-board clock capability to do very high precision, high stability timing which is one foundational bedrock positional accuracy

These satellites don't have the on-board clock capability to do very high precision, high stability timing which is one foundational bedrock positional accuracy is based on. Just as important though is that they don't have the world-wide network of ground tracking stations monitoring their orbit. The orbital positions and velocity need to be known to within a meter or so, and not only are these not being tracked at that level, which is a very expensive undertaking, but they are also in LEO which means their orbits are much more affected by atmosphere and are less stable.