How do I know if someone subscribed to me via RSS

I love RSS. Ever since I've discovered it thanks to Net News Wire, I have moved a lot of my reading to it.

Reading in NNW via RSS enabled me to delete the browser tab I had for reading. It also enabled me to expand my reading list. There are twenty five items in the list. One perpetual to-do item I have now is creating a blog-roll on my website.

I so prefer the whole experience that I unsubscribed to a few people, and now read them via RSS instead. I was getting weekly posts from seths.blog for example. Now I subscribe to them on RSS instead.

I want RSS everywhere.

One interesting conundrum I've found myself in is from the writer's perspective though.

As a writer if I cared only about whether people read me or not, I would have no issues with RSS. But if I want to know how many people I'm reaching, then RSS by its very nature does not provide any solution.

Email subscriptions do that. I can see how many people read my emails. With basic analytics, I also know who opened my email. I don't need more. The problem with emails is that email apps do not provide a good reading experience. The UI problem is easy to solve though.

If someone subscribes to me via RSS, how do I know they are subscribed to me?

There are people who would tag or reach out via socials or email. But most people do not want that. I think. I imagine most people to be me. I just want to read.

Does it matter? That I don't know if fifty people subscribe to me or forty? I think it does. I keep going back to thousand true fans. If I don't know who has subscribed to me, how can I talk to them. How would I know that I will have a thousand true fans?

Can the RSS protocol be updated to include some sort of very basic analytics?