Game/software preservation is important.
Ownership by license, always-online DRM, and ownership tied to online libraries - they're all unreliable and publishers will take away your purchase and not give back if they so wish. Or even try to resell it later.
https://www.youtube.com/watch?v=nsZYaK343cY
This sort of thing is why I'll always prefer physical copies of games over digital. That, and I don't have the internet to be downloading anything over like, 3GB.