Isn’t this service nothing related to using existing infrastructure?

It looks like Amazon is sending you base stations to set up a private network in one location.

>I doubt Amazon has many towers of their own

Their offering page specifically says that AWS "delivers your network hardware (small cell radio base-station and servers) Attach power and internet connectivity to smart cells and servers"

They are not using telco partnerships here, or at least if they are, it's not on the level of carving out a chunk of the telco network for private use.

I struggle to see how this remains a "cloud" offering rather than a hardware rental.

But this doesn't use telco towers? Amazon is literally selling antenae.

I think this is more like long haul wifi for your corporate campus, factory, port, university etc. Maybe even for things like parking meters (san francisco's parking meters are famously being updated/upgraded because they're ending EDGE network used by the modems in the parking meters)