This argument shows up in all these discussions and is way way overused. The EU only has ~2-3x the population density of the USA. It's not even a single order of magnitude and people have already given examples of how very remote places in Europe have very reasonable infrastructure. If you already have telephone and/or electricity poles to somewhere running fiber is definitely an easy problem to tackle for what is supposed to be the world's most advanced economy. Capture by telco special interests is a much more likely explanation.