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The definition of vapoware is things that are delayed continously after they should have been released.

The BE-4 fits into that.

vaporware is a product that has been announced but never materializes.

Right, like the BE-4 engine.

A project is not vaporware until it gets canceled without delivering.

Wikipedia: "announced to the general public but is late or never actually manufactured nor officially cancelled"

Is official cancellation necessary?