Interesting philosophy, but just tried it with "bokeh" and well, the results are pretty bad? "Related keywords" are interesting, but many miss the last letter. The result list shows some reviews for old smartphones. Nothing relevant at all. Whereas if I type this into Google, results look way better.
Tried the reverse: One related keyword for "bokeh" is "out-of-focus". I typed "out of focus" into both Google and Chantal. Google: first result mentions bokeh. Chantal: Also mentioned somewhere, but not as a related keyword.
Nice choice of keyword. I kind of suspect "dumbrish" needs to be more of a first pass for classifying things as opposed to the whole story.
Interestingly, using it as an exact keyword seems to improve some of the links but just empties the related keywords list.
This feels like an approach that can work really well for topic-specific searches (despite the hole you spotted) but that probably won't ever generalize. Still... I'd have liked to have it for a couple of topics that I used to patrol forums and post basic answers for.
Tried the reverse: One related keyword for "bokeh" is "out-of-focus". I typed "out of focus" into both Google and Chantal. Google: first result mentions bokeh. Chantal: Also mentioned somewhere, but not as a related keyword.