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Bitcoin has one function: as a currency. That is it, despite what anyone says or any semantic games people might play.

Ethereum has many functions, including currency, but right now it's mainly used as a currency and a test-bed.

Steemit and Numerai are blockchain projects that have specific purposes (social networking/media and quant hedge fund auctions) with which they lead. Sure, they can both serve as currencies, too, but neither has the scale to win on that dimension. But they both are showing unique blockchain applications that are non-currency and useful right now and used right now. It's awesome.

Interesting that all of these experiments somehow postulate that their cryptoeconomics tend to add value to their systems as a whole over time. So basically non-currency are what some of us call app-coins xD

Not quite. My context is to delineate usecases not to fit a currency into a procrustean box, which is a mistake. I'm not a maximalist of any stripe and think there are many iterations of the multiverse in which anything could be a currency (and also where cryptocurrency never gain any more ground or don't matter). I'm open to it, I just think some are more likely in the future than others and very few today really qualify.

Appcoin (and altcoin) are too limiting. I've dropped then from my vocab.