The real issue is that it's just not interesting or worth it.
Why would you want to put LTE or Starlink on a drone? Flight time is around 30 minutes with current battery technology and you're not legally allowed to fly past line of sight anyway. Strapping a bunch of extra gear to a drone would cut flight times and add basically nothing to the experience.
These things aren't popular because they're not interesting to the people who build and fly drones.