Just installed yesterday. At first I thought it wasn't working since it showed text that looked like an easy to read captcha so I disabled it and then reenabled it today and it's working fine. I guess there must be delay before it begins working. I think it's a great idea just for the difficulty that it will cause to spam bots, and yet it's relatively easy for someone who's first language is the same as the one used in the advert. It might be a little difficult for a speaker of another language.
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