Anywhere you can readily build infrastructure on the ground it will be less expensive and more scalable than satellite service. Satellites will be excellent for extending coverage and providing redundancy, but packets origins and destination are always on the ground so there will always be a premium for sending them through orbital infrastructure.

There are underserved areas where Amazon's delivery infrastructure might present opportunities to build out wired and area wifi services to the surrounding community. I'm not thinking they would or anything, it would be a slower and lower return investment than trying to compete for the satellite market because there are plenty of people who don't have to care about the premium.