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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.
Bots on Reddit already steal parts of upvoted comments and post them elsewhere in the same post to get upvotes themselves (so the account can be used for spam later)
Even with context they can be very difficult to spot sometimes.