The poor who invest in Bitcoin are still not enough to get rich, their economy would improve, but they will step up to middle class. Then back to your first sentence, middle class will disappear, so they ended up become poor again because they not own the business nor system.
Getting rich is very hard, what we see on social medias are mostly upper middle class who could back to poor if they make mistake in financial decision.
Poor people can rise to the middle class in the long run through Bitcoin investments. Many will return to poverty, as they won't have sustainable income. I agree, but some can remain middle class or even become richer. Anything can happen, depending on how an individual seizes opportunities. There's no better option than accumulating Bitcoin and financially transitioning into the middle class than remaining poor.