

GPL is especially popular with people who don’t want their labor of love to become a source of free labor for corporations who will tweak it, close the source, directly profit off it, and never donate or contribute patches. For them, it’s an antiparasitic license.









You don’t need it to be unanimous, but if it’s not unanimous, you have to rewrite the parts from people who refused or can’t be contacted. If their sum contributions aren’t too big, it can be feasible but a lot of work. If too many or if key contributors refuse, the work can scale exponentially.