Their legal team is vicious about taking down any open-source implementation of the W3W encoding algorithm. This is sad because it could be legitimately useful in a small handful of circumstances, but only if it were free and open to all.

We released WhatFreeWords last week and it was taken down after 4 days.

It is back up now at https://whatfreewords.org/ but who knows for how long.

You can read their DMCA notice to our previous hosting at https://whatfreewords.org/download/dmca-20190917.pdf