what3words has appeared twice recently as a news story on bbc.co.uk
I'd not heard of plus.codes even though now I realise I'd seen them on google maps listings
The most recent article [1] read like an advertisement. They even quoted someone as saying "I just cannot see a downside". It's a shame they didn't find time to mention any of the many criticisms of it, most of which are listed on Wikipedia!
[1]: https://www.bbc.co.uk/news/uk-england-49319760