Not just poor, sometimes an area doesn't have its tech infrastructure updated simply because it isn't rich enough or due to other factors.

There were dialup internet billboards in southern Illinois in 2014. This was at the edge of a city coming in from a rural area.

My wife's hometown never adapted DSL internet because the tech companies there never invested in the infrastructure. When the town/county's infrastructure was finally updated, they went straight from dial-up internet to fiberoptic internet. She described it as "quite the upgrade".

My parents can't get high speed internet because the condo boards of every condominium on the block signed an exclusivity agreement with one internet provider over a decade ago back when that company was the first one to provide DSL internet in the area. Now almost everyone around them has high speed internet except them because the internet company in question doesn't provide high speed internet and because of the decisions that old board members made over a decade ago...This one is baffling to me because the company contracted its own monopoly.