I never said it would replace terrestrial networks... you invented that claim yourself and are responding to a strawman.
Starlink mobile is for rural areas, and the other 90% of the planet that's not well served by traditional terrestrial networks.
And 40% of earth's population live in rural areas, so there is a large market for this kind of service.
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In regions like Nigeria or the Philippines, Starlink costs over 100% of the average monthly income. The individual addressable rural market really is closer to 1% than 40%.