I think that the point here is that as a user, with MIT you may not have a choice. Of course, you would never choose a FreeBSD fork that isn't open. But if you buy a TV running a closed fork of FreeBSD you might never even find out. In that case, it was great for the developer: they were able to get a great OS for free. However, it was not great for the user: they get a closed OS that they can't patch, upgrade, downgrade, or change in any way that the developer doesn't approve of.
Ok look, i have that TV that run's Linux, they even send me a "CD" with all the source-code of linux/gnu of it, BUT there is that highly proprietary module loaded into the kernel, firmware and so on, so patching my TV is as easy as re-engineering a whole closed-source system.
In theory the idea is great, in reality it makes nearly no difference.
