I mean, a good enough rock can be considered a tool. Same as an antler or a bone.

I love how no matter how much the market makes it explicitly clear that an idea is absolutely terrible, Microsoft will just be like, “we’re doing it anyway, fuck you.” The best argument for Linux is just to gesture vaguely at Windows.

You don’t follow the license that it was distributed under.

Commonly, if you use open source code in your project and that code is under a license that requires your project to be open source if you do that, but then you keep yours closed source.