A single cablemodem serves all in that household. A single fiber connection serves all in a company.
A single dish can serve multiple users. So while there may indeed be a billion people some day who communicate using LEO satellite constellations (which includes Starlink), it's very unlikely a billion subscribers -- unless you also include their LTE (Direct to Cell) subscribers.
I would absolutely include LTE, since most networks in the west are keen on using Starlink for the time being to “fill in” blind spots.
In a few years however they may be in direct competition with Starlink, who are also building base stations on the ground.
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