The blog posts suggests many websites are using ReCAPTCHA when it is not truly needed. In those cases, given the focus of ReCAPTCHA on identity, this is a case of collecting more information than is needed. According the author, ReCAPTCHA is not needed to defeat "uncustomised spam". To put it another way, while there be nothing wrong with ReCAPTCHA itself (e.g. the way it is designed), there could be something wrong with the way it is being used, perhaps on a massive scale.