There are those who demand journal peer-review be paid extra on top of academic salaries.
https://www.nature.com/articles/d41586-023-00403-8
Let's have a look at the financials of that proposal.
The article above confirms common rates of academic consulting fees, i.e., anything between US$100 for graduate students and US$350 for faculty:
https://statistics.rutgers.edu/consulting-fees
Taking US$200 as an easy, round average for, say, a post-doc hour seems to cover most cases. Anything less is just exploitation, pure and simple.