They're not a cellular network; their base stations are not innumerable tiny mobile devices. They'll be small but sizable permanent mounts, so they can control geographic density if needed. It's a different beast so the same pressures don't apply.

Heck, it's not even certain to be direct-to-consumer. Starlink makes for a really nice backhaul system, which could be really handy to feed a bunch of smaller terrestrial cells, for example.