I worked with DataCamp through their course authors program and found it to be a poorly run organization. They maintain a publicly accessible "wishlist" of courses that they claim to want to develop. Think twice before putting your course proposal forward: they'll want free labor from you in a form of course outlines and code samples. After you send these over to them, they'll tell you that they are no longer interested in working with you on the course from the wishlist and ask for other outlines and samples. Courtesy requests that are a norm in the industry, like taking a course off the wishlist while  you are working on it are ignored.
Ask HN: Who is hiring? (May 2019)