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I'm less concerned with the implementation than I am with the principle.

In principle, I have reservations about exposing content to search engines but then requiring payment to read it. Especially if it's non-trivial to filter out the sources that require payment.

But a plugin which works around an attempt to restrict visibility of content to those who've paid for it ... I thnk the intent here is wrong.

I think it's ok to have information that's only accessible to a restricted set of viewers.

It's not that it's not possible. It's not that the implementations aren't dumb. It's that the principle of "if I want it, and I can do it, then it's ok" doesn't really hold up, IMO.