Radio transmissions easy to tap. A big concern for companies worried about competitors stealing plans. This is important because if the satellite moves, the ground antenna must follow its movements. Satellite typically acts as a repeater , receiving signals from earth on one channel and rebroadcasting them on another. Satellite may rebroadcast data over an area covering large fraction of the earth's surface.
International agreements regulate how satellites are used, and how frequencies are allocated.
Weather effects certain frequencies. In interactive terms, propagation delay alone inserts a 1 second delay between typing a character and receiving its echo. One of few alternatives to phone companies for long distances. Easy to place unauthorized taps into signal. Satellites have recently fallen out of favor relative to fiber.