Yes, that's how property works most anywhere that has stable government. Societies where The State has a monopoly on violence are usually far more stable and pleasant to live in than ones where vigilantism is how correction of injuries is done.
> Reddit comments are freely accessible by the public, yes?
In exactly the same way that the books in my local public library are freely accessibly to the public, yes. I'm sure that you're aware there are so many things you can't legally do with books in your local public library. Reddit isn't substantially different... go read the "User Agreement" contract that governs use of the site when you get a free hour or two.
> To read this post you must pay me $5. Please leave your contact information...
You can totally prevent me from -among other things- making many sorts of commercial uses of your post, but -as I'm sure you know- the made-up system you're gesturing at not how software licenses have worked for roughly as long as software has been a thing that was commonly licensed.
Anyway. It sounds like you want a return to "publish nothing, keep everything of worth secret to anyone not in the guild, and do what needs done to people who the guild suspects has betrayed its secrets". Those were the really bad old days, and the awfulness of that system was why the US adopted the patent system back in the late 1700s. It's also part of why it adopted the copyright system [0] as well as limited term lengths (fourteen years, with an option for fourteen more if the work's author was still alive and explicitly requested an extension).
[0] Though, you had to explicitly register your work with the relevant authorities to get protection... unregistered works received no protection. Things stayed this way for roughly two hundred years, and -IMO- should have stayed that way.