They aren't losing a lot of wealth, they don't have it.
What you say doesn't make any sense. For someone poor with $50 of savings, if they lose $5 it might not seem much to you, but it might be to them. It actually is a lot of money if you're considering someone really poor, especially in poorer countries.
I assume you're probably in the US and think that making money is as easy as it is for most people there everywhere. No, it is not easy for everyone, and not everyone lives in the US.
This is not valid for the poor people making $15,000 a year with $600 in their bank account. These people are losing a lot of wealth.
Debt is not that easily accessed by everyone! And when it comes at the cost of inflation as it often (or even almost always!) does, it's even worse.