When businesses pursue content marketing, the main focus should be the needs of the prospect or customer. Once a business has identified the customer's need, information can be presented in a variety of formats, including news, video, white papers, e-books, infographics, email newsletters, case studies, podcasts, how-to guides, question and answer articles, photos, blogs, etc. Most of these formats belong to the digital channel.
I think each tries to accommodate for a worldwide audience. In general, as a copywriter, you need to be prepared to write for different audiences (and a worldwide audience), especially in this digital age. And the underlying principles of copywriting will be the same, wherever you learn them – but when you come to crafting the copy itself, you’ll just have to be aware of UK/US spelling and phrasing. Good question, Evan