All copyleft really is a cost. "I will give you the fruits of my labor, but in exchange, you must share your enhancements on the same terms."
I'd re-word it as "in exchange, if you share your enhancements, you must do so on the same terms". Because lots of people think that if you modify for your personal use, or if a company modifies for its own internal use, they must share those changes, which is not true.
I'd re-word it as "in exchange, if you share your enhancements, you must do so on the same terms". Because lots of people think that if you modify for your personal use, or if a company modifies for its own internal use, they must share those changes, which is not true.