I'd love to set this up for my rural community. I've got a good connection but many people have no cell service, no dsl lines, no cable...literally nothing. Until something like starlink is ubiquitous i feel like this could go a long way to solving their problems.
I don't think this solves the last-mile problem. You still have to provide (get) internet connectivity; Amazon just relays that landline to 5G.
And in rural areas, 5G probably doesn't give you enough range anyhow. Have you considered mesh revenue-share networks like Althea (https://www.althea.net/)? There's a nonprofit one too operating in several cities, but I can't remember what it's called.
5G can operate at lower frequencies, from my notes I do not remember where I copied it from.
"In quick summary, the bands work as follows in the real world. One low band (600-700MHz) tower can cover hundreds of square miles with 5G service that ranges in speed from 30 to 250 megabits per second (Mbps). A mid band (2.5/3.5GHz) tower covers a several-mile radius with 5G that currently ranges from 100 to 900Mbps. Lastly, a high band (millimeter wave/24-39GHz) tower covers a one-mile or lower radius while delivering roughly 1-3Gbps speeds. Each of these tiers will improve in performance over time."
It isn't replacement to Starlink because you need a backhaul. You can however take one Starlink and use it to distribute among others. Bottleneck is the backhaul