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Works well against bots
I implemented this as the last line in a suite of configs/addons to defeat bots that were able to pass captcha. I don't recommend any single addon as a solution for everything but this one really closed the gap once I was able to defeat bots that failed up to the captcha check.
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Comments
Shumoo
thx for the help testing with Captcha registration in Vanilla 2.1 as well as providing the bug fixes for captcha.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.