“Several million USD” is a tiny sum for any country, including the poorest. In aggregate, many such sums will impact the budget, but as a single expense it’s next to nothing. Besides, with jobs going to Cuban workers, much of the money will benefit the Cuban economy, and eventually the Cuban government.

The lack of starving Cuban is due to good distribution of what wealth there is. It also makes one realize how well Cuban economy works, considering the economic warfare the US has waged on them.

As for Cuban prisoners in Guantanamo, I suspect that Cuba may have perfectly adequate facilities on their own turf; why on Earth would they need to use Guantanamo?