Out of character I’m going to point out that a lot of poor people deeply distrust banks because they charge every fee imaginable. One of the most frequent criticisms I see is that poor people will spend a large portion of their income on gold jewelry. Yeah, because it’s a store of value that’s independent of predatory bank fees. As @SoyViking said, people are not broke because they don’t know how to make a budget. People are broke because wages are too low and prices are too high.