As for private buildouts being better than government funded infrastructure, that is only true as long as profit is your single measure of "better".
When it comes to services that we don't want any downtime for and want everyone to have access to, then government funded infrastructure has done better than capitalist forces. Water and electricity are both services we want everyone to have access to that as uninterrupted as possible. It's still not perfect as situations like Flint or industrial water usage in California pulling out water without paying enough to be sustsinable, but a capitalist system for those services would lead to many not being able to pay enough for access and going without as well as interruptions in service as companies push their systems to the bone for efficiency or go out of business
There are a myriad of reasons for the embargo on Cuba. Let's not sugar coat this fact just to use it as an example of "American imperialism".
The reason they drive classic cars has nothing to do with the embargo:
After Fidel Castro assumed power in 1959, he imposed a new law that prevented anyone without government permission from importing foreign automobiles. That turned Cuba into a car museum in the making, sealing the island off from the automotive future.
You should also keep in mind it was possible to get a new car imported, but you needed government permission to do so. This meant only the rich, celebrities and professional athletes were allowed to do so, keeping the majority of the population fending for themselves to keep their old decaying cars alive and working.