It’s not that it is technically challenging. Imagine if tomorrow, someone decided the number 7 was offensive and could no longer be used. But they are nice, you only need to replace 7s in any system that supports firmware/software updates. Futhermore, we’ll limit it to anything that generates or consumes mapping data. . .Annnnd go!
Might be easy to do, doesn’t mean people are simply going to do it because some subset of the population found it offensive. Maybe if you’d reported this before W3W sold their services to anyone else. Now, why would they risk breaking things that depend on that word?
This is not a defense of W3W, just a response on why practically speaking, it makes sense that they’d refuse to make a change, even if doing so may be trivial, at just the naive technical level, to roll out.