Freedoms 1-3 exist with BSD, too, they just aren't protected. There are few cases where freedom 0 exists without the other 3, but one case where that's true is

Freedoms 1-3 exist with BSD, too, they just aren't protected. There are few cases where freedom 0 exists without the other 3, but one case where that's true is with some of the Microsoft tooling around the CLR. In such cases, I, as someone who doesn't know low-level Windows programming, can't realistically change the software myself, but I could pay someone else to do it. But since I don't have freedoms 1-3, my only option is to pay MS if I want that modification. There is a very small group of people in the world who can afford to pay Microsoft for customizations. So even as someone who would never make modifications to the software, I care (and my boss who wasn't even a developer would care) because we had to work around limitations of our tools rather than paying someone to fix them.