Genuinely interested. How does or doesn't an existing satellite constrain other operators from desirable orbits? Is it irrelevant because many satellites can share the same orbit at different phase angles (i.e. satellite train), and there are more than enough similar orbits to go around? How many spacecraft would it take to actually be a concern (accounting for attrition from end-of-life ones going out of service, and the point of crowding where diminishing spatial/temporal buffers available for the collision avoidance adjustments needed to practically maintain your desired orbit become too risky).