Possible abuses:
(1) Use the information to actually interfere or collide with satellites
(2) Use the information to track secret satellites by excluding traces from non-secret ones
(3) Free riders gaining secondary access without providing data
(4) Use access to this when traffic is more contended to enforce hegemony
(5) Anti-competitive coordination under the rubric of cooperation
And while the system might be helpful under ordinary peacetime conditions, will it make a war more or less destructive?
It's silly that NASA is planning for Mars and the moon but hasn't already solved this coordination problem on a world scale.