Predatory authors:
"Predatory authors, where undeserving scientists impose themselves as coauthors on other people’s papers. All of these predatory activities serve the purpose of padding one’s CV, and the higher you rank, the more freedom you get to engage in predatory activities. Predatory authorships is a quite pervasive phenomenon, since probably every publishing academic can name some of their coauthors who never contributed anything of value to their paper."
https://forbetterscience.com/2020/02/04/predatory-authors-by-wolfgang-dreybrodt/
Also:
Paper mill: what is it and why is it wrong?
https://www.econjobrumors.com/topic/paper-mill-what-is-it-and-why-is-it-wrong