https://www.vox.com/2018/5/8/17308744/bullshit-jobs-book-david-graeber-occupy-wall-street-karl-marx

This interview clarifies a few points. I think Bullshit Jobbers are also random positions created by rich rentier to artificially inflate their company, thus their pride. "I manage a consulting agency of over 300 people", sounds really nice at a fancy dinner, even though half employees are underpaid young interns.