Earlier quoted context omitted.
> If they want to just shut the whole thing down, that is fine too. Actually if it's under a non-restrictive open source licence, it's not fine at all - the code will still be legally available for everyone.
I should've worded that better. Of course they can't pull the existing versions, but then can shut down any further development and support.
Not really. A fork can easily continue developing and supporting it.