Let me explain, please...
I DO believe in free software, I left m$ windows for slackware GNU/linux some years ago, and I do know the freedoms and rights in it...
I was just saying that, yes, it's a hidden beaviour.
It's hidden simply 'cause you don't know it will happen, and 'cause not every one looks at it's meta tags (if he knows what it is...) and still less goes digging into code to remove some unwanted dislikable feature; I did (grep -ri framework capsman/ ,grep -ri meta capsman/ , in linux shell) and didn't find that line...
I'm not a programmer, should I open all files and try to deode how does it put that line on page output?
There were some other discussed plugins that, for example, make believe that a donation was not voluntary, or added their link to blogroll, ad this was officially judget a nasty feature; ok, it's not a visible line on the page, but I found it disturbing the same.
Then, really Txanny, we can not compare WordPress (that is THE site) and the theme (that is THE thing we see in the browser) that put, rightly, their line to meta, to a backend plugin...
If the 10% of existing plugins would have this behaviour, our meta will explode!
It's ok to put credits for comment, sliders, all the useful charmy plugins we use, but, please, just ask first.