[magicalist]

I'm not entirely sure it's helpful to lump all of those together; there is at least some difference in kind.

I think dragonwriter's sibling comment to yours is pretty apt here. It's hard to tell the difference between something that will be submitted to standards bodies any day now and something that really will be submitted to standards bodies any day now. At a certain point (with e.g. Pepper) the statute of limitations runs out and you have to assume it's just going to be an open-source but proprietary API.

Of course, whether or not overloading "proprietary" is useful is a different discussion. Mostly it seems these conversations eventually just devolve into arguments over definitions of the word for no real insight.