Bitcoin (BTC) is seen as a currency, but due to volatility, it is pretty much an asset. This will change in time when the fluctuations in the value of the currency is more stable.
But presently, even a one minute time lapse can see major and dramatic changes in the currency as we speak. And because of that it is an ASSET.
Furthermore, 99% of people that bought BTC don't know how the currency works. And that is a recipe for disaster.
SOURCE: https://www.cnbc.com/2017/12/07/kevin-oleary-bitcoin-is-an-asset-not-a-currency.html