No more individuality for you, slave

You won’t be able to use custom domains after November, 2023.

https://www.bigtechwire.com/2022/11/02/microsoft-is-killing-custom-domain-names-in-outlook-com/

This is a head-scratcher, for sure. Why would Microsoft do this? Is Google next? It is hard to understand any real technical justification for the move. Ideas?