Both the GPL and BSD licenses give developers that want to build on software others wrote rights that they do not have by default.
However, compared to BSD licenses, the GPL gives fewer rights to those 3rd party developers. It also gives users of the software those developers write rights. BSD licenses, on the other hand, leave it to those developers to decide what they want to give their users.
So yes, the GPL isn't about control in the way proprietary licenses are, but it is about control.
However, compared to BSD licenses, the GPL gives fewer rights to those 3rd party developers. It also gives users of the software those developers write rights. BSD licenses, on the other hand, leave it to those developers to decide what they want to give their users.
So yes, the GPL isn't about control in the way proprietary licenses are, but it is about control.