There's so many more things that are ambiguous.

If I give away the software but sell support, am I only liable to customers or to everyone? Similarly, if I let people opt in to commercialization of their data, am I liable to those that opt out? Does someone signing a terms of service qualify as commercial activity?

If I fork something and give it away can I sue the person I forked it from? If I tell people "YOU ARE NOT ALLOWED TO USE THIS BUT YOU CAN FORK IT" am I liable if they ignore me? Does a fork qualify as a new product or is the original author liable?