One Technical reason is that there is a lot of land to cover in order to provide service nation wide. There's a 25 square mile area where my parents are locate

One Technical reason is that there is a lot of land to cover in order to provide service nation wide. There's a 25 square mile area where my parents are located that is covered by a single 4g/5g tower. There are 15 houses in that area, probably not all of them are customers of the company that owns the tower. I'm sure there is other anti-competitive stuff going on as well but infra in most of the EU and US can't really be compared in the same way.