alt Hacker NewsCopyleft isn't about the software authors freedom, it's about the end-users freedom. Copyleft grants the end-user the freedom to study and modify the code, i.e. the right to repair. Contrast this with closed-source software which may incorporate permissively licensed code: the end-user has no right to study, no right to modify, and no right to repair. Ergo less freedom.
I think it makes a lot of sense for hobby software and non-commercial software. It's just tough to do in a commercial setting for a number of reasons.
So ultimately while good intentioned, you end up limiting how many people can use what you've built.