[TFNA]

For academic books, which are after all a substantial part of Anna, the publishers aren’t usually paying the editors if the book is a collection of papers. The editors got paid by the grant funding for the project that produced the research.

Moreover, many respected academic publishers no longer provide proofreading or typesetting: they expect the authors or editors to commission their own proofreading, and the editors to just send in a PDF with camera-ready output.

For monographs, the “editor” that the publisher provides is only there to guide the author in producing their own camera-ready output, and does not actually do any work on the contents of the book. The publisher will hand off the manuscript to 1–2 peer reviewers, but those peer reviewers are unpaid.