Misspelling will be oh-so-costly.
I wonder how much of that has been considered in that system. Easy-to-misspell words, people not wanting "idiot.lives.here" as their home address, etc. I suppose a lot of effort was put into getting this right. But this is a start-up, not a a centuries-old, established system.
https://map.what3words.com/help.driver.lost https://map.what3words.com/driver.lost.help
It's a scam. The media should really stop repeating press releases.