Due to the use of metaphones for comparison of input to blacklisted words, it's very easy to blacklist completely normal words. I suggest adding a very visible note in the project description, warning the user to be careful with the words they blacklist.
For example, I just ran into a problem with the text 'hello 123' being rejected. Turns out the word 'hell' is in the site's blacklist, and the metaphones for both words are identical. This could have been a very frustrating experience for someone that can't look into the module's code and figure out what's going on.
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