Satellite operators are still required to comply with the Federal Wiretap Act (and equivalent in every other country of the world).

The result is a less-than-optimal network that requires routing communications through a ground station (where it can be intercepted) even when it's technically feasible (and optimal) to use point-to-point communications.

The resulting technical solutions (at least) double the bandwidth and processing required by the network, and bandwidth/processing are critical resources for communications satellites. These requirements can make or break the economic feasibility of a proposed system.