End of the day if you don't like it or agree with it don't use it.
It's not like they've deleted Ordinance Survey grid references.
Should maps be supplied free of charge?. Surely Ordinance Survey have monetised finding out where you are already?.
Ordnance Survey do provide maps free of charge. Sure, they sell landranger foldouts and I forget the name of the other class, but what they're selling isn't just the map, it's a high-quality, weather-resistant printing of the map.
AFAICS the data underpinning the printed maps is free to use with attribution, they also provide APIs for interacting with their database, again, for free.
They do monetise this in the form of premium integration plans but I honestly can't tell what the difference is between the free and the premium one.
Plus OS do not have a monopoly on mapping, whether digital or otherwise.
Conversely, W3W is an attempt to create an exclusive product, and they seek to enforce their nascent monopoly with lots of legal threats, if they so much as suspect that someone is working in the same space.