I could almost agree but I think there is value in copyleft: a hack of copyright to ensure users have some of the rights copyright denies when you get a copy/derivative work from another.

With no copyright it's great that you won't be sued if you share software but in practice a mere binary isn't enough (reverse engineering is impractical). We need the source code to be able to change it (or understand what it's even doing). I won't support removing all copyright law without a solution.