In contrast to what Drew says, Plan 9 probably failed because it was proprietary, not because of the Unix predecessor. If it had a free licence at the time, I

In contrast to what Drew says, Plan 9 probably failed because it was proprietary, not because of the Unix predecessor. If it had a free licence at the time, I doubt RMS would have felt the need for GNU, though I don't know what he'd make of some of the design.