Of course it can't apply to everything so maybe any code running on a piece of hardware you purchase also gives you an individual license to modify, view or update the code?
That's when they suddenly develop a great affection for the "community" and "giving back" :)
In large orgs it can be a costly process for large codebases. Requires a bunch of planning. Large codebases (sometimes with code from acquisitions/different source control systems/clients/sold off divisions etc) are full of all kinds of stuff (stolen code, proprietary code licensed from others, non attributed open source stuff, server passwords, user data etc etc) that no one knows anything about. All that needs to be checked sometimes by a large number of tech people and then legal teams to make sure no one gets sued.