In 2014 over 400,000 articles were published in about 8000 journals that many regard as predatory.1 The term “predatory publishers” was first used by Jeffrey Beall of the University of Colorado, who until recently documented this phenomenon on his blog and in an annual list.2 Although this term, and variants such as “predatory journals”, are widely used, they have been criticised.3e5 One proble...