[fluoridation]

Even if I grant that, radio towers don't deorbit after a few years. I have no idea what you mean by antennas being digital.

[inemesitaffia]

Older sats (and OneWeb) use parabolic dishes. Some fixed, some steerable.

Apart from being SDR's, Starlink and its newer competition use phased array antennas. So they can provide extra capacity to denser areas.