Don't get money in the way, it's irrelevant. Made it to support team member in trouble, retired it as soon as it wasn't required anymore.
Free version is a fixed date in timeline and comes with his batch of bugs obviously, bugless doesn't exist, but fixed as soon as possible/reported which your didn't had unless customer obviously.
I have no idea why you being that up here, we were discussing if Mobius was first of not doing GUI