Starlink uses phased arrays pointed at the ground but lasers between satellites. So it wouldn’t be impossible to spin one around and have it bounce traffic to earth through the swarm pointing down.

But these satellites are very close to earth compared to the moon. It wouldn’t only save 0.3% transmit power vs just sending right to the surface. It’s very unlikely the consumer antennas could manage hitting an earth satellite from the moon.

> Technically GPS can work from the moon.

Well, one side of it.