The sibling post's point about differences in prices/costs below is correct. The dominant cost of deploying and maintaining fiber is labor costs, which vary dramatically by country. It's not like consumer electronics that is all made in China and costs the same around the world.

The Romanian model of "micro ISPs," ISPs serving a few blocks here and there, is also illegal in most U.S. cities. The U.S. places a very high value on universal coverage, both of lower-income people and rural people. In nearly any U.S. city, the only way you will get permission to build Internet service to anyone is if you agree to also serve low-income communities or rural parts of town, even if doing so isn't profitable.