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there are only so many slogans etc that each company would want you to write about them, so it would be no problem for spammers to even just brute force it. Hire someone to copy down all the possible "answers", and you just gotta work out what company logo is shown.
good idea but i don't think it has any real use. it would just get abused quickly. maybe something like this is why google bought that re-captcha though
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