(1) Poland is a LOT smaller than the United States. It's not much bigger than the state of Wyoming, yet it has more than 60x the population. That makes building infrastructure a lot cheaper and more profitable.
(2) The US had the Internet FIRST. That's not an advantage when it comes to infrastructure. For example, England had roads hundreds of years before the US did, so roads in the United States are quite a bit better. Rome had running water (of a sort) a long time before most anywhere else but I'll bet its water situation today is quite a bit worse on average than most of the United States.