Gladly go back to every site having an animated ‘under construction’ gif.

Enabling the ability for purchasers to specify an arbitrary server to connect to would require a design change compared to how most games are recently. That feature used to be standard in the early years of online gaming.

We had online-only multiplayer games in the early 2000s with self-hosted servers supporting over 60 players per map. It’s absolutely possible to do better with today’s tech.