Real investments have a return derived from capital. A house, for example, can be rented out for money. Or a business can earn profit and distribute it to its shareholders. You can try to buy and sell houses like people did during the RE bubble for profit, or try to buy and sell stocks like a day trader, but these are still fundamentally different from an "asset" which has no means by which to generate a return on its own.

You can buy goods and services with Bitcoin. It's just another currency. Do people claim that forex is not investing?

Yes, all the time. It's clearly speculation (in the technical sense)

Not really though. You can buy a few novelties online and there are a handful of places that accept bitcoin, but realistically it is not "just another currency", it's an IOU for usable money.