Yep, but it's also like insanely easy to pirate (good or bad, you decide). I guess op means a system where you have your (digital) copy and can sell, give or lend it, but still it would be "protected", and big business doesn't allow that.

It's ownership of the file, but that alone does not guarantee that you can still play the game. If they revoke the online access and it's an online only game you cannot play. If they remove any and all updates you could get for the game then you could not play especially if it has day zero breaking bugs or incomplete game think something like cyberpunk 2077, but it could be worse. This isn't 1990 anymore we no longer get complete games.