High density -> large populations.

Density, generally, makes service provision easier.

Contrarywise, Starlink (or other broadcast-based services) perform poorly in high-density areas, where there's high bandwidth contention. Building out to serve such locations, which are by definition few and fairly sparsely distributed, as your map indicates, increases total system costs markedly.

Starlink at scale is optimised for sparse, low-income populations, rather than dense, high-income ones. That's probably a significant liability eventually, though for now I'll have to note I'm impressed with the technical accomplishments, regardless of reservations on persons involved.