There is apparently an entire branch of research called Reviewer Reliability. Someone on HN pointed that out to me a couple of years back, when we were discussing the problem with fake/bought/manipulated/blackhat product reviews.

In a hilarious twist of fate, searching for that term brings up papers on either medical research or peer-review reliability problems in general[0]. You try to find data on a potentially abstract, complex societal issue, and come up with what can only be described as attention grabbing HN-catnip.

0: https://www.cambridge.org/core/journals/behavioral-and-brain...