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In those situations, captchas don't offer any improvement over a text field that always asks you to put a 3 in it. It's just different enough from other systems that it requires custom programming, and that's just not worth it for most small websites.


If I'm specifically targeting that website, what's stopping me from writing a bot that would simply enter 3 all the time?


If a website is low-value, you won't be specifically targeting it in particular.




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