Seems like Starlink has potential to completely disrupt undersea cables once the network is larger. Obviously it wont ever be the same latency or bandwidth as an undersea cable but it would be near impossible to tap and much cheaper.
You might need a drone with an antenna the same size as the ground station's. I haven't seen the ground stations, but that might be hard to put on a drone.
You're right that it won't be the same - it has the potential to be faster.
Speed of light in a vacuum is higher than what can be achieved in a fiber-optic. Combine that with a more direct path than what can be achieved with an undersea cable and things start to get interesting.