In Catania 10 gbit Internet costs 35 euros/month and is available everywhere in the city and even in a big slice of the small towns around Catania. And indeed public incentives played a big role. But what I believe it is more interesting is that 1 gigabit was common like 10 years ago or even more. Infrastructure is a bit too important to be left to what the market believes will be profitable.
Btw the paradox I have is that my local lan is 1 gbit...