Bash is copyleft (GPLv3). Zsh is permissively-licensed.
Apple, for instance, switched from bash to zsh when the GPL version upgraded because they wanted to withhold those rights from their users.
Zsh should be considered harmful as a tool of corporate encroachment and subjugation of Free Software.




















It’s permissively-licensed (as opposed to bash, which is GPLv3). Pushing zsh over bash is part of a larger effort by corporations to marginalize copyleft so they can more easily exploit Free Software at the users’ expense. Don’t fall for it!