You cannot keep a stationary drone in the sky for long stretches of time. Their field of view is also going to be massively smaller than a satellite. You would need a lot of them just to keep the same amount of coverage.
How do you know nobody is interested in the 'ocean and empty stretches of land'? It could provide a lot of meteorological and geological data for scientists for example.
How do you know nobody is interested in the 'ocean and empty stretches of land'? It could provide a lot of meteorological and geological data for scientists for example.