It's not meant to replace terrestrial networks, it's a space-based alternative that serves areas carriers have no financial incentive to cover. Terrestrial cellular towers cost between $150k to $500k per tower, and are not economically feasible in less populated areas. There are also many dead-zones in mountainous regions, since cell signals are blocked by mountains.
Starlink Mobile supplements this, it's simply cheaper for mobile providers to partner with them than do their own buildout. Currently only 5% of the earth's surface is covered by cellular signals. Starlink will push that up to 85+%, and is backward compatible with existing cellphones.
> it's a space-based alternative that serves areas carriers have no financial incentive to cover
In a nutshell: they're serving a market that has less money to spend using more expensive tech than the current industry leaders. Maybe I'm wrong but it doesn't scream "massive profit".
Well if you make the argument that it will replace terrestrial networks and that's why its worth X trillion $ then yes, you do actually need to cover the 1% of earth surface where the waste majority of people actually spend most of their time.
The question is not if its a good business, the question if its a 2 trillion $ business, and if you only cover the 95% of earth without coverage. That more like a couple 100 billion $ business at best.
> Terrestrial cellular towers cost between $150k to $500k per tower
I'd be interested to find out exactly where this cost exists. I would expect the majority of the cost (especially in rural/mountainous areas) to be more with power and backhaul, rather than the physical radio gear. Because it's rural, you should be able to easily just use coverage bands (ie 850 MHz or 900 MHz) with relatively high transmission power. This would easily be able to cover 300 km2.
Because of the higher transmission power, and the fact that the tower would be in the middle of nowhere, wouldn't the OPEX be higher, with smaller numbers for CAPEX?