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Bots are better than humans at cracking ‘Are you a robot?’ Captcha tests, study finds
(www.independent.co.uk)
This is a most excellent place for technology news and articles.
Or the other approach, make it even harder for humans
...which is the current trend.
I've found that a lot of sites use captchas or captcha-like systems as a means of frustrating users as a way of keeping away certain people that they don't want to access the site (intellectual property owners), though it's not the only tactic that they use. I mean it works, pretty much all of those sites are still up today, despite serving data that's copyrighted by Nintendo, Sony, and other parties.