How does the article not call this out? It even says
Just how much of that is paid for by trading profits is unclear, and influencers usually make their money by selling private courses or learning materials or by offering premium access to trading tips for a fee. Others work on commission and are paid by brokers each time one of their followers opens an account. And in some places, the lure of forex trading is simply that it offers the possibility of a regular income.
Classic pyramid scheme. It works great in poor countries since people aren't as educated, and are more vulnerable to get rich quick schemes. Same reason MLM's in the US target immigrants.