Forbes: "Morning Brew’s native advertising revenue averages $200,000 a week thanks to more than 40 active clients, including Microsoft, JPMorgan and Allbirds."
There are lots of examples of newsletters that make money, but if you're only counting single authors who aren't venture backed and who don't have a following from some other medium and aren't already famous within their industry, and who are making money off of paying subscribers or ads rather than from consulting, the number is fairly low.
For example, a newsletter providing curated governmental data related to animal welfare can't charge much because most animal welfare groups are struggling to operate on the small donations they get. However, a newsletter tailored for the opposite group (commercial farming) will make a lot more money because its audience is willing and able to spend 10x compared to the former.
Same goes for finance vs human rights (not that they are necessarily opposed), and so on.
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So, yo dawg.