Benefit to the person is probably a path to citizenship and more economic opportunities (especially since being a camgirl is a young person’s career with almost no long-term prospects)

Benefit to the USA, being generous, is that those earnings of the camgirl may then be spent in the US instead of flowing overseas. At least some of it will.

Critics would rightly point out though that importing thousands of camgirls increases demand for apartments (and even more than the typical person because I bet they’re less likely to live with roommates than a typical woman of the same age) and we have a massive housing crisis in all cities. Maybe if the camgirls want to move to the rust belt or something, it could still work out net positive.