I think bitcoin is also considered as a property because I think it's like a currency. You can use it to buy other goods and services. A great asset to make a profit is to earn big money from your product when you are saving the bank
I think bitcoin is not an asset, but it has value like a physical asset. How we can buy one land or house and after few years the land value increase like that bitcoin value also increase if you save this coin for a long time. But it does not have value like a physical asset. The price drop in the market will not affect much on a physical asset, but it will effect on bitcoins.