No money to earn. The contribution of core journals will only have a contribution fee, but it will not be much. Only the core journals will pay the manuscript fee, not every article. Generally speaking, it would be nice to publish it for free. After all, academic journals all need the paid pages of authors to publish articles, because they all "need" to publish papers for the purpose of protecting research, graduation, scholarship evaluation and other tasks, or just to share their academic achievements, which is also the author's own "need" to publish.