If you have multiple digital titles, then this one is for you. Editorial teams often tend to get isolated from each other and rarely share their work.
Content once created and published goes stale very soon. Cross posting to other sites is a way for increasing pageviews and even engagement without too much of additional effort.
Plus, you might just discover new audiences, new niches and new revenue opportunities for your brands. As long as you do not overwhelm a site with cross posted content and you keep an eye on how your audience is reacting to them, there is no harm in cross posting content. In fact, it should be encouraged. Finally, do remember to set the canonical URL for cross posted articles so that you do not loose out on SEO