GPL requires you to give back; MIT gives you the choice. Developers are by nature creative people. And humans are not incapable of altruism. Even with an MIT

GPL requires you to give back; MIT gives you the choice. Developers are by nature creative people. And humans are not incapable of altruism. Even with an MIT license, I expect a lot of community contributions to pour in. In fact, I expect more community contributions to come in. MIT means (perhaps) a lower percentage of users will give back, but there will be a higher absolute number of users since the license is more permissive.