NumOpen I suggest to use a copylefted license for Flarum, to prevent a company to use all the developper work in a proprietary software without contributing to Flarum. GNU AGPL for example ? (not GNU GPL because it's a web software).
Toby This has been discussed to some extent here. We're quite happy with the MIT license. We don't want people to be restricted on what they can do/how they can use Flarum.