saying they won’t use it because the license doesn’t allow them to redistribute the app with malware, or charge money for it
They won’t use it because the licence creates an inbalance of power, so the creator of the app have more control than the actual user. An app/program is just an set of instructions how to do something.
Why not charge for it? If you just copied and not make anything new noone is going to give you money anyway, while taking something and selling after improvements is literally how all buissness always worked. Maybe except mining or haunting.
As for malware, I bet creator of malware won’t be suddenly stopped by a licence text.