In Denmark we're doing it because we've invested so much in a comprehensive national digital post system, which is so good that the volume of letters is so vanishingly small that even a private actor will barely be able to turn a profit from delivering them.
From the article
Danes will still be able to send letters, using the delivery company Dao, which already delivers letters in Denmark but will expand its services from 1 January from about 30m letters in 2025 to 80m next year. But customers will instead have to go to a Dao shop to post their letters – or pay extra to have it collected from home – and pay for postage either online or via an app.
My goodness. At this point I can't believe you're trying to be dense. You just are.