Constellation based systems are not a good system.

The only benefit they bring is low latency, and they have severe downsides to get that latency. Their orbits are so low that they need to account for atmospheric drag, and many satellites simply burn up in the upper atmosphere before their lifespan is complete.

Geosynchronous or other high altitude satellites also offer global coverage without costing billions in maintenance launches, and are only a few dozen milliseconds slower for connections. High altitude satellites are also less vulnerable to physical attack, and only need to be replaced when they run out of station keeping fuel.