[praptak]

It is not that simple. There's a continuum from writing a compiler to coding DestroyBaghdad. Usually people draw the line at "Is this tool primary purpose evil?".

This tool is in a (darkish-)gray area IMHO. I don't think that employer blocking "fuck" or racial slurs is necessarily evil but it's not that good either.

Automatic filters are pretty bad at doing their job, so filtering is a lame approach to solving anything.

[handoflixue]

A tool that can block discussion of unionization is certainly a grey area. When you literally advertise "blocking discussion of unionization", I feel like you've left that grey area, though.