You're right, totally missed that! Let me double check at work in a few minutes but I'll probably add an MIT license with a disclaimer to please don't be a jerk and offer a paid hosted version yourself
If you don't want anyone else to make money from the project perhaps designing your application in clear parts and releasing them as open source libraries would have made more sense. Releasing the whole thing as open source, encouraging contributions while wanting to be the only one able to profit from said source seems wrong. Wordpress don't stop others making money from hosting.