Never really thought about all of this, hard to say one "good" way to catch all of the freeloaders while allowing for copying older posts. Also a reason I would never want to be the one looking for these posts. (No clue about the drama, just wanted to put my 2-cents in on the reuse dilemma)
My biggest thing is effort, was there any effort in making it better and ultimately cultivating a better experience for learning or whatnot while reading?
I think it's fair to say that as one grows, new audiences develop while older "fans" slowly fall off and seek different content and newer people. Void of rewards, and the idea of asking for rewards twice, new people to your content may not see your previous posts. Or even better, you just improved a ton and felt you could reach a larger audience and explain better than the original. (But again this goes into improving enough to the point of deserving a new post and rewards)
It's impossible to ride the line between good re-use and freeloading with solid parameters but that's where I feel like things should be. Just like everything in this world, the first draft is always going to be the ugliest, due time and effort make the fruits of labor.
I know this is a bit scatterbrain, in essence, I agree with everything @revise.leo said in his comment.