There's a lot of misguided thinking behind Recaptcha nonsense, principally the idea that they have to make the test harder in order to fool unsophisticated robots, but all that does is alienate legitimate users. It's up there with making everyone take their shoes off at the airport to prevent terrorists, or making riders answer tricky info control questions to prevent cheating by looking at Google Maps - the supposed benefits are too slight to justify making people jump through these hoops.
I've noticed some sites eschew the Recaptcha nonsense in favour of a simple checkbox for you to indicate that "I am not a robot". I had been wondering how such a system could possibly beat a robot - surely robots these days are sophisticated enough to be able to lie, which probably has Isaac Asimov turning in his grave but hey, that's the harsh reality - but I understand this works by analysing your mouse movements as part of the process, so there's more to it than just ticking the box. Very clever.