The actual amount/distribution of stuff can be misleading. What really matters is the risk of collision, which is the highest for Sun-synchronous orbits. The fa

The actual amount/distribution of stuff can be misleading. What really matters is the risk of collision, which is the highest for Sun-synchronous orbits. The fact that lower SSOs are also the most convenient for remote sensing work doesn't help. GEO is more or less safe because it's unstable (dead stuff drifts outwards), well kept (slots are limited by the resolution of customers' terminals) and typically doesn't have high relative velocities.