Unless a blog really has ~50,000+ daily uniques, or a lucractive audience niche, I suspect there’s not much opportunity to monetize even if they wanted to.
As someone getting into RSS more recently, I've definitely struggled to find decent sites to follow (though trawling hackernews totally helps:)).
Note there are ways to get an RSS feed from some sites without them (RSS-Bridge[0] is what I use), but the experience is much better if the site natively produces one.
In time, you'll find yourself with hundreds of feeds on a variety of topics.
He always seems to have interesting links to good blog posts.
It isn't practical for consumers of content to try and find the quality content mixed among the mass of dross when content is spread out among individual creators. This gives rise to aggregators. And even aggregators of quality content cost money to run. Maybe you'd use HN as a counter example but HN isn't run out of the benevolence of ycombinator, there are secondary benefits that justify the costs.
So my comment shouldn't be taken as "there's no such thing as quality content without costs" and if I made it too easy to interpret that way instead of more charitably, that's my fault.
So let me amend it: You don't get concentrations of quality content without costs.
Here's some quality content: https://www.raptitude.com/
I've been following that blog for years, via RSS. Every article he writes, I read. He gives it away. You can support him by becoming a patron or signing up to courses, etc. he offers. No advertising, and very high quality.
I keep hearing how RSS is dead for many years. My favorite blogs seem to be doing fine, its not like my newsblur stream of posts has decreased over the years.
Many people are unhappy about non-monetized readers and authors just being happy off by themselves. The people most able to "fix" that are the happy readers and authors, and the readers are not very motivated to spam and tax themselves, and the authors obviously don't mind not monetizing or they wouldn't be blogging to begin with.
There doesn't seem to be an obvious disruptive force or angle to apply force to "improve" the stable situation of a distributed decentralized happy unmonetized ecosystem.