Let's throw another couple of scenarios into the legal wrangle.
Take the blogger who reuses your content by using a title, an excerpt, and crediting you with a no-follow link. While this third party site is not a splog, you could still argue that your copyright is being infringed by a mix of factors such as that your brand is somehow damaged, there is no added public benefit, and because the blogger profits from SEO-induced traffic assisting the conversion of clicks on adverts alongside your material while compromising the marketability of your original work.
The blogger's in breach but, then again, a tweak to the facts may change your attitude.
This time, let's say the difference is that the blogger has a PR5 site, is relevant to your market, and is giving you a follow link. Everything else is the same.