[gnicholas]

Parody is a defense you can raise, but it's tricky to win. [1] And even if you do win, you've got to pay your lawyers who made the arguments for you.

If I were arguing for W3W, I would point out that in some dialects of British English (where W3W is based), "what three words" and "what free words" would be pronounced identically. This means that in verbal communication, it would be very difficult to tell the two apart. That would make it harder to win a parody case, since in spoken language people wouldn't even be able to tell that you were saying something different.

1: https://www.lottfischer.com/blog/trademark-parody/