That's the first one I have heard of. Congratulations, Evan! Kickstarters such as this are fantastic, and I am glad to see it was successful.
The debate is (or should be) about paid advocacy, not paid editing. Many people are paid in part to help add free knowledge, often by popular demand, to the commons. Wiki-PR evaded the en:wp guidelines about paid advocacy, published their own third-party articles to fake the appearance of multiple independent sources, and used socks to hide their connection. These are not comparable.