"undeserving scientists impose themselves as coauthors on other people’s papers"

"Worldwide, the number of authors per publication is constantly increasing. Today, the average number of authors in geosciences is 9, in environmental sciences 6, in medicine 11 and in biochemistry, genetics, molecular biology 17...Publishing in natural sciences proceeds under structures similar to the mafia"
https://forbetterscience.com/2020/02/04/predatory-authors-by-wolfgang-dreybrodt/

The mafia quote is not even exaggerated because in some highly competitive universities there are in fact harsh bullying practices that led to the suicide of junior scientists 
https://www.timeshighereducation.com/features/poisonous-science-dark-side-lab

And I'm not even mentioning the suicide of Full Professors https://pacheco-torgal.blogspot.com/2019/09/imperial-collegegreat-scientists-leave.html  

See also the post of January 21 https://pacheco-torgal.blogspot.com/2020/01/times-up-for-super-scientists.html