Some could be drawn to a promise of a "new world system." However, WTS rules and policies, demands will burn them out more quickly.
The third-world countries have a high demand to work as much as possible just to have basic needs. The WTS has no real understanding or sympathy of what that means. Such third-world citizens utilize word of mouth, to express an American religion that is too demanding and truly not helpful to them. They need schooling and medical help available, of which the WTS will offer none of that. At least, many other religions will try to do some with this upfront, immediate need.