Here are the problems with the OP's argument as I see it.

1. Most of these countries have a poor economy because they have a small middle class. There are wealthy and poor people with not much in between. Introducing a game to these countries will also bring wealthy players who will splash around at the higher limits.

2. Winning 15/30 players do not grow on trees. Few adults that do not currently know the rules of poker could be winning players at 15/30. The lower limits you could teach someone a formulaic approach to win, so any affect would likely only be felt there.

3. Most "sweatshops" do not require much training for the work involved. It will likely take months of training before any employee is profitable. The employees will be paid a low wage to train, but it still takes time and money, plus you have to have someone educate them. I think setting these sweatshops up is easier said than done.