Is when the average Cuban has better bandwidth than the average US Citizen because they actually decided to build infrastructure
That will take a while -- Cuba is one of the least connected countries in the world and they are making a big deal of making slow DSL "available" to half their homes by 2020.
That being said, there are good reasons for them to remain independent -- I wouldn't wish Comcast or TWC on anyone.
Then the common people will see Chinese companies and workers building infrastructure for their benefit, generating goodwill.
The Chinese role in Cuba has been different than in Africa, where Chinese companies and Chinese workers build roads, etc. The Chinese were involved in financing and installing Cuba's udersea cable, but on the island China has been an equipment vendor with Cubans installing and running the networks.
I wouldn't be surprised to learn the details of this successful "bid" may include 100% financing by China, probably at low interest, so Cuba don't have to pay a dime upfront.
China has at times had problems collecting Cuban debt. (See the Wikileak quote in the post; however, it has been reported that they lent the money for the undersea cable then participated in its installation. That does sound like the US -- give or loan money to be used to purchase products from US companies. A sweet deal for the US companies.
That's more likely what they're doing. Seeing how far they can expand the Fi network.
In what sense does this let them expand the Fi network? Maybe they could do a deal with an ISP like Comcast to let them do public facing access over home routers (http://cis471.blogspot.com/2014/03/isp-competition-testing-time-warner.html), but why would an ISP go for that?
Ocean: A body of water occupying about two-thirds of a world made for man -- who has no gills. -- Ambrose Bierce