I'm actually not entirely sure why this upsets you.
The thing is, this is sort of a paradox.
Your content everywhere will drive down the value of it (just like the stock market).
The thing is, if it's good content, it will get copied.
So it's a question of do you want to turn yourself into a content cop? I think you likely have better things to do. You get the Google juice. Copies have a severely limited use anyway, they are substandard content.
If this really, really bothers you, maybe you should look into a Copyscape acc't or something. Better than tediously checking the web for copies. Their Sentry will inform you when a copy is found, they have a scary "don't copy" banner.
If you want, you could tell the site that copied your stuff "Link to the original or take it down", but then you need to be ready to escalate this if they refuse.
Not to be too blunt, but look at what you could gain vs what you will lose.
You could gain a (Pyrrhic) victory.
You will lose more time and resources.