Because of the creation of the internet and social media, it's easier than it ever has been for anyone to publish content which will potentially reach large audiences.
With many people using social media as their main source of news consumption, some people have been taking advantage of this.
Creating and spreading fake news stories can be very profitable, as more outrageous or shocking headlines that people see through advertising or other means will likely generate more clicks than mundane topics. So, as a result of this publishers utilize fake news to drive revenue.