If you are planning to get the mobile version of Discourse and wrap it into a Cordova app, then yeah, probably you’re not OK for at least couple of reasons:
- First is, obviously, the legal one.
- Second is more like practical. You’ll have to push a new version of the app on every Discourse update
However, I don’t think the GPL also cover the API calls, so if you decide to build an app that will only consume the Discourse API you’ll solve both of the above issues.
Considering the GPL license, I’m pretty sure the founders won’t have anything against this with two exceptions:
So as long as you don’t use Discourse name or logo, founders probably have nothing against this.
So I’d say your beef is with Apple, not with Discourse.